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DD-F Series · Compact ducted · Fresh air + HEPA

DD-F Series — ducted inverter dehumidifiers with fresh air and HEPA, 32–155 L/day

Compact ducted models from 32 to 155 L/day for residential, small-commercial, healthcare and high-purity environments — including small indoor pools and spa areas where fresh air and dehumidification are needed together. Two inlets (recirculation + fresh outdoor air) and one supply outlet, with an automatic fresh-air valve driven by the 5-in-1 air sensor (CO₂, PM2.5, TVOC, humidity, temperature). HEPA H13 filtration as standard. Single-phase 220–230 V, inverter compressor and fan (Full Inverter) with EEV, R-32 refrigerant, E-Coating, UV + Anion purification with Antifungus treatment, Modbus RTU RS-485 + Wi-Fi connectivity. Ultra-Slim housing for concealed above-ceiling installation.

Capacity32–155L/day
Supply air410–1150m³/h
Fresh air0–380m³/h
Power supply220–230 V
FiltrationG4 + HEPA H13
CompressorInverter

About the DD-F Series

The DanVex DD-F Series is a range of compact ducted dehumidifiers for residential and small-commercial environments where a single concealed unit must deliver humidity control, fresh-air intake and high-grade filtration together. Capacity runs from 32 L/day (DD-36F) to 155 L/day (DD-136F) with supply airflow of 410–1150 m³/h — all on single-phase 220–230 V, with no need for a three-phase supply.

Every unit is built around a two-inlet / one-outlet airflow architecture: one duct for recirculated return air from the room, and a second for fresh outdoor-air intake controlled by an automatic valve. The two streams mix inside the unit, pass through a G4 pre-filter and a HEPA H13 final filter, are dehumidified, sterilised by a UV lamp and delivered through a single supply outlet. A 5-in-1 sensor on the return stream continuously monitors CO₂, PM2.5, TVOC, humidity and temperature — the unit adjusts the fresh-air valve and operating mode to indoor air quality, not just the humidity set-point.

Each unit pairs an inverter compressor with an inverter fan (Full Inverter) and an electronic expansion valve (EEV) — compressor and fan continuously adjust output to the actual load and stabilise airflow, while the EEV meters refrigerant precisely for peak circuit efficiency. For quiet operation the housing uses pyramid-profile acoustic insulation that absorbs compressor vibration rather than merely containing it. Standard across the range: Hot Gas Defrost, E-Coating, internal Antifungus treatment, R-32 refrigerant and Modbus RTU RS-485 + Wi-Fi connectivity. The Ultra-Slim housing installs invisibly in the ceiling void — only the grilles show in the finished room. Noise below 32 dB(A) on DD-36F / DD-56F and below 35 dB(A) on DD-96F / DD-136F — suitable for bedrooms, clinics and offices.

Slide-out module maintenance. In conventional dehumidifiers, maintenance becomes a problem once faults begin: repair usually means calling an expensive licensed specialist for refrigerant-containing equipment, electrical and brazing work (not permitted everywhere), or removing the whole unit. The DD-F is designed to make repair simple: the compressor, main control board, heat exchangers and refrigerant piping sit together in a single slide-out cassette that pulls out of the housing for service, repair or replacement. One technician disconnects the main module and fits a replacement in about 15 minutes, and the unit runs as new — fast service without dismantling installed equipment.

Models in the range

DD-36F  32–44 L/day · 410–500 m³/h supply · 0–200 m³/h fresh · 120 Pa · 62 kg · Full Inverter · HEPA H13

Indicative coverage: ~50–90 m² depending on conditions

For small residential and compact commercial spaces: studio apartments, small offices, dental and medical consulting rooms, single hotel rooms, allergy-sensitive nurseries. Variable power 460–850 W, R-32 × 550 g. Noise below 32 dB(A).

DD-56F  45–75 L/day · 450–600 m³/h supply · 0–200 m³/h fresh · 120 Pa · 67 kg · Full Inverter · HEPA H13

Indicative coverage: ~80–130 m² depending on conditions

For medium residential and small commercial use: family apartments, larger living spaces, small clinics, retail outlets, classrooms, asthma-sensitive environments. Variable power 550–970 W, R-32 × 600 g. Noise below 32 dB(A).

DD-96F  98–145 L/day · 650–870 m³/h supply · 0–300 m³/h fresh · 150 Pa · 69 kg · Full Inverter · HEPA H13

Indicative coverage: ~130–200 m² depending on conditions

For large residential and small commercial use: large family homes, basements with moisture load, medical clinics, dental practices, small server rooms, luxury hotel suites. Variable power 920–1260 W, R-32 × 720 g. Noise below 35 dB(A).

DD-136F  110–155 L/day · 800–1150 m³/h supply · 0–380 m³/h fresh · 180 Pa · 72 kg · Full Inverter · HEPA H13

Indicative coverage: ~180–280 m² depending on conditions

For large residential and small commercial installations: multi-room homes, large basements, medium healthcare facilities, boutique hotels, multi-zone offices, educational facilities. Variable power 1100–1860 W, R-32 × 850 g. Noise below 35 dB(A).

Coverage figures are indicative for typical residential and small-commercial conditions (moderate moisture load, 2.5–3.5 m ceilings, ordinary air exchange). The actual choice depends on starting and target humidity, ceiling height, infiltration and whether fresh-air intake runs continuously or by CO₂. For basements with active groundwater, indoor pools, hot tubs and specialised medical applications — request precise project sizing.

Which model should I choose?

The main selection variables: floor area / room volume, target fresh-air flow and acoustic requirements.

Selection criterionDD-36FDD-56FDD-96FDD-136F
Capacity32–44 L/day45–75 L/day98–145 L/day110–155 L/day
Supply airflow410–500 m³/h450–600 m³/h650–870 m³/h800–1150 m³/h
Fresh-air flow0–200 m³/h0–200 m³/h0–300 m³/h0–380 m³/h
Static pressure120 Pa120 Pa150 Pa180 Pa
Noise (1 m)< 32 dB(A)< 32 dB(A)< 35 dB(A)< 35 dB(A)
Indicative coverage~50–90 m²~80–130 m²~130–200 m²~180–280 m²
Best forStudios, small consulting rooms, single bedrooms, allergy-sensitive roomsFamily apartments, small clinics, classrooms, asthma-sensitive environmentsLarge homes, basements, clinics, server rooms, hotel suitesMulti-room homes, boutique hotels, offices, healthcare facilities

Where is the DD-F Series used?

The series is designed for the residential and small-commercial range, where compact installation, single-phase supply, fresh-air management and anti-allergen filtration matter more than raw capacity:

Residential homesHealthcare clinicsSmall commercial Educational facilitiesAllergy-sensitive spacesSmall server rooms

Application guide

ApplicationTarget humidityTypical needsRecommended models
Residential — small apartments and studios45–55%Compact installation; quiet operation; anti-allergen-grade airDD-36F · DD-56F
Residential — family and large homes45–55%Whole-house ductwork; fresh-air intake; quiet bedroomsDD-56F · DD-96F · DD-136F
Residential basements50–60%Higher moisture load; condensation prevention; mould riskDD-96F · DD-136F
Small indoor pools and spa areas50–60%High latent load from open water; fresh air equally essential; quiet operation next to relaxation areasDD-96F · DD-136F
Healthcare — dental and general clinics40–55%Anti-allergen HEPA H13 filtration; CO₂ control in waiting roomsDD-56F · DD-96F
Small offices and retail45–55%Fresh-air intake; CO₂ management; quiet operationDD-56F · DD-96F · DD-136F
Classrooms and education45–55%CO₂ control in occupied spaces; allergen filtrationDD-96F · DD-136F
Allergy-sensitive rooms (children, asthma)40–50%HEPA H13 essential; low noise; fresh air with PM2.5 controlDD-36F · DD-56F · DD-96F
Small server rooms40–50%Continuous operation; HEPA against dust; tight RH rangeDD-56F · DD-96F
Boutique hotels and hospitality45–55%Multi-zone distribution; fresh air to every room; quiet operationDD-96F · DD-136F

Fresh-air management — the full explanation

The defining feature of the DD-F Series — versus the DD Series and conventional dehumidifiers — is the automatic fresh-air valve paired with the 5-in-1 sensor. This section explains how it works, why it matters and where its limits lie.

Two inlets, one outlet. Every unit has two air inlets and one supply outlet. The first inlet (200 mm round duct) draws return air from the room; the second (150 mm) draws fresh outdoor air through a separate external wall connection. Inside the unit an automatic motorised damper varies the mix of recirculation and outdoor air. The combined stream passes through G4, then HEPA H13, then the evaporator coil (dehumidification), then the UV lamp and anion generator (purification), and is delivered through the 200 mm outlet.

CO₂-driven. The sensor measures CO₂ concentration continuously. When the threshold is exceeded (typical residential setting 800–1000 ppm; clinical 600–800 ppm), the damper opens to admit outdoor air and dilute CO₂ below the threshold. When it falls, the damper closes — recirculation only, with no unnecessary outdoor heating or cooling load. Threshold values are adjustable via the digital controller and the Wi-Fi app.

What does it replace? Without the DD-F, a comparable result requires three separate systems: a standalone dehumidifier, an energy-recovery ventilator (ERV) for fresh-air intake and a HEPA-grade air purifier. The DD-F integrates all three functions in one ceiling unit — single-phase supply, one 200 mm supply duct, one set of grilles in the room.

For installations that require full heating or cooling alongside dehumidification and fresh air — see the DD-FX Series for integrated climate control.

Fresh air or recirculation — your choice. The DD-F works as a fresh-air supply unit or as a pure recirculation dehumidifier. For recirculation-only operation, select dehumidification mode and leave the outdoor duct unconnected or keep the damper closed: the unit draws room air, dehumidifies it, filters it through HEPA and returns it — with no outdoor-air intake and its loads. Useful where a separate ventilation system handles fresh air, where outdoor air quality is temporarily poor, or where minimum energy consumption is the priority. Switching to fresh-air mode is simply opening the damper and selecting automatic mode. Manual override: the valve can be set manually — fully closed for maximum energy efficiency in harsh outdoor conditions, fully open for purge ventilation, or at a fixed position for a defined air-change rate.

How does DD-F compare with the alternatives?

The DD-F occupies a specific niche: compact ducted dehumidification with fresh air and HEPA on single-phase supply. Each common alternative has conditions where it is justified:

AlternativeWhen it beats DD-FWhen DD-F is better
DD Series (ducted, no fresh air or HEPA, three-phase)Higher capacity needed (above 155 L/day); three-phase supply available; no fresh-air or HEPA requirement; lower equipment cost per litre.Single-phase site; fresh-air management needed (CO₂ control); anti-allergen-grade HEPA H13 needed; smaller residential/commercial scale.
HRV / ERV system (heat-recovery ventilation)Continuously high fresh-air rates in cold climates where exhaust heat recovery matters for the energy balance; new construction with budget for both systems.Dehumidification is the primary requirement; HEPA filtration needed; single-unit ceiling installation; allergy-sensitive applications.
Wall- or floor-mounted unit (DanVex DEH-WP Series)No ceiling void available; budget-sensitive single-room installation; mobile need.Distribution to several rooms from one unit; concealed installation (aesthetics); fresh-air management needed; HEPA-grade filtration needed.
Standalone HEPA purifier + separate dehumidifierA dehumidifier is already installed; very small scale where one room is sensitive and humidity is handled centrally.An integrated solution with one ceiling unit, one duct network and one controller; whole-house or multi-room scale; strict aesthetics; less maintenance in the long run.
DD-FX Series (full climate control with heating/cooling)Heating and cooling needed (climate control); precise low-temperature cooling (beverage cellar, server room); humidification needed.Heating/cooling provided by other systems (radiators, central air conditioning); the lower price and simpler installation of the DD-F are sufficient.

Key technologies — at a glance

  • Automatic fresh-air valve — a motorised damper varies the mix of return air (200 mm inlet) and fresh outdoor air (150 mm inlet) under control of the 5-in-1 sensor; fresh-air flow 0–200 m³/h (DD-36F / DD-56F), 0–300 m³/h (DD-96F), 0–380 m³/h (DD-136F)
  • HEPA H13 filtration — second stage after the G4 pre-filter, captures ≥ 99.95% of MPPS particles including pollen, mould spores, bacteria, fine dust and PM2.5
  • 5-in-1 air quality sensor — continuous monitoring on the return stream; adjusts the fresh-air valve and operating mode by CO₂, PM2.5, TVOC, humidity and temperature
  • Full Inverter across the range — inverter compressor, inverter fan and EEV as one system: continuously variable output to the actual load, no humidity swings and lower consumption
  • Hot Gas Defrost — a fast defrost cycle versus around 30 minutes for natural defrost; operation from +5 °C with no appreciable capacity loss
  • E-Coating on the heat exchanger across the range — an electrochemical layer resistant to moisture, salt vapour, mild acids and cleaning agents
  • Pyramid-profile acoustic insulation — the housing lining absorbs compressor vibration rather than merely containing it, for quiet operation in occupied rooms
  • Slide-out service module — compressor, main board, exchangers and refrigerant piping in one cassette; module exchange in about 15 minutes
  • UV lamp + anion generator + Antifungus treatment — standard across the range

Technical specifications — DD-F Series

ParameterDD-36FDD-56FDD-96FDD-136F
Dehumidification capacity (30 °C / 80% RH)32–44 L/day45–75 L/day98–145 L/day110–155 L/day
Supply airflow410–500 m³/h450–600 m³/h650–870 m³/h800–1150 m³/h
Return airflow410–500 m³/h450–600 m³/h570–870 m³/h770–1150 m³/h
Fresh-air flow0–200 m³/h0–200 m³/h0–300 m³/h0–380 m³/h
External static pressure120 Pa120 Pa150 Pa180 Pa
Rated power460–850 W550–970 W920–1260 W1100–1860 W
Current2.0–3.8 A2.5–4.4 A4.1–5.7 A5.0–8.5 A
RefrigerantR-32 × 550 gR-32 × 600 gR-32 × 720 gR-32 × 850 g
Noise level (1 m)< 32 dB(A)< 32 dB(A)< 35 dB(A)< 35 dB(A)
Dimensions (L×W×H)1160×590×325 mm1160×590×325 mm1200×640×370 mm1200×640×370 mm
Net / gross weight62 / 67 kg67 / 72 kg69 / 74 kg72 / 77 kg
Operating humidity range45–100% RH
Operating temperature range+5…+38 °C
Voltage / frequency220–230 V single-phase / 50–60 Hz
CompressorInverter (Full Inverter)
Heat-exchanger protectionE-Coating
Defrost systemHot Gas Defrost
FiltrationG4 pre-filter + HEPA H13 final
Air purificationUV sterilisation + anion generator
Internal Antifungus treatmentYes
Air quality sensor5-in-1: CO₂ · PM2.5 · TVOC · RH · T°
Fresh-air valveAutomatic by CO₂ · manual override
Return / supply ductØ 200 mm round
Fresh-air ductØ 150 mm round
ConnectivityWi-Fi + Modbus RTU RS-485

Frequently asked questions

What is the ideal indoor humidity level for a home?
The generally accepted comfort range for residential indoor air is 40–55% relative humidity, with a slight seasonal variation. Below 30% RH eyes, throat and skin dry out and the respiratory mucosa lose their protective function. Above 60% RH dust mites multiply rapidly, mould growth accelerates on cold surfaces and the perceived temperature feels degrees higher than actual. The ASHRAE 55 thermal-comfort standard recommends keeping relative humidity between 30% and 60%. For allergy-sensitive household members (asthma, dust-mite allergy) the target is the lower end — 40–45% — with HEPA-grade filtration. DanVex DD-F units combine both: precise humidity control through Full Inverter and HEPA H13 filtration as standard.
Why do modern homes need fresh-air ventilation in addition to dehumidification?
Modern homes built to energy-efficiency standards are deliberately airtight — high-performance insulation, sealed envelopes and triple glazing reduce heat loss but also reduce natural air exchange. Typical new construction achieves 0.3–0.6 air changes per hour through infiltration, versus 1–2 in pre-1990s buildings. Tight envelopes save heating energy but trap indoor pollutants: CO₂ from occupants' breathing (a person produces about 30 g/h; in a closed bedroom CO₂ reaches 2000–3000 ppm overnight, far above the 1000 ppm comfort threshold); VOCs and formaldehyde from furniture, paints and cleaning products; moisture from cooking, showering, laundry and breathing; combustion products from gas hobs and candles. ASHRAE 62.2 recommends mechanical ventilation of 7.5 L/s per person plus 0.03 L/s per m² of floor area. The DanVex DD-F Series brings in this fresh air automatically through its CO₂-driven valve, with HEPA H13 filtration of the outdoor air before it enters the room — addressing indoor air quality and ventilation in a single unit.
What CO₂ level should healthy indoor air target?
Ambient outdoor CO₂ concentration is currently around 420 ppm. Indoors it rises above this with occupants' breathing, and the level is a widely adopted indicator of ventilation rate and air quality. Generally accepted thresholds: below 600 ppm — fresh, well-ventilated air; 600–1000 ppm — acceptable, ordinary residential and office conditions; 1000–1400 ppm — onset of drowsiness and reduced concentration (Harvard COGfx and LBNL studies); above 1400 ppm — measurable cognitive impairment in decision-making and problem-solving; above 2500 ppm — headaches and significant cognitive decline. ASHRAE 62.1 recommends keeping CO₂ no more than 700 ppm above outdoor ambient (i.e. below about 1100 ppm). In closed bedrooms CO₂ typically reaches 2000–3000 ppm overnight without ventilation. The DanVex DD-F Series monitors CO₂ continuously through the 5-in-1 sensor and opens the fresh-air valve automatically when the adjustable threshold is exceeded (typical setting 800–1000 ppm residential, 600–800 ppm clinical).
What does HEPA H13 actually filter and when do I need it?
HEPA filters (High-Efficiency Particulate Air) are classified under the European standard EN 1822 in grades H10 to H14 by capture efficiency at MPPS (the most penetrating particle size, 0.1–0.3 μm). HEPA H13 captures at least 99.95% of particles at MPPS in a single pass. What it catches: pollen (10–100 μm) — practically completely; mould spores (1–30 μm) — practically completely; dust-mite allergens on dust particles (0.5–50 μm); fine atmospheric dust and PM2.5 — with high capture; bacteria (0.3–5 μm) — most species; viral aerosols — partially (viruses smaller than 0.1 μm pass singly, but most are carried on larger droplets that are captured). When H13 justifies its higher pressure drop versus standard F7: allergy-sensitive household members (hay fever, asthma, dust-mite allergy); young children; dental and medical practices; veterinary clinics; server rooms where fine dust deposition harms equipment; locations near busy roads or wind-blown dust. HEPA H13 is standard on every DanVex DD-F model.
How quiet is a residential dehumidifier?
Noise level is measured in A-weighted decibels dB(A) at a defined distance — usually one metre. Reference points: 20 dB(A) — rustling leaves; 30 dB(A) — a quiet bedroom at night; 40 dB(A) — a quiet office; 50 dB(A) — normal conversation in a quiet room; 60 dB(A) — speech at one metre; 70 dB(A) — a vacuum cleaner. Every 10 dB increase is perceived as roughly a doubling of loudness. For residential equipment inside or near occupied spaces, below 35 dB(A) at one metre counts as very quiet — comparable to a premium refrigerator. The DanVex DD-F Series runs below 32 dB(A) on DD-36F and DD-56F, and below 35 dB(A) on DD-96F and DD-136F. With concealed installation in the ceiling void, the ceiling structure adds a further 10–15 dB(A) of attenuation depending on material, so the perceived noise in the room is below ordinary ventilation — generally inaudible during normal activity and unnoticeable even in quiet bedrooms.
What is the difference between a dehumidifier and an air conditioner for humidity control?
Both remove moisture from indoor air, but a dehumidifier is optimised for it while an air conditioner removes it as a side effect. An air conditioner primarily cools the air; as warm humid air passes over its cold evaporator, water condenses and drains away. But its humidity control is approximate: it cycles on temperature, not humidity; when the set-point is reached the compressor stops and humidity drift resumes. In mild weather (low cooling load) the air conditioner barely runs and removes little moisture. A dehumidifier works directly on humidity, in proportion to the moisture load, and on inverter models continuously modulates its output to hold ±2–3% RH. Energy efficiency differs too: air-conditioner cooling is costly because the removed heat must be rejected outdoors, whereas standalone dehumidifiers keep the heat indoors (the latent heat of condensation returns to the air) — more efficient when only humidity control is required, as in transitional seasons, basements, pools and humid coastal climates. The DD-F Series is built specifically for humidity control, with Full Inverter for stable humidity, integrated fresh-air management and HEPA H13 filtration that air-conditioning systems do not provide.

Explore further

Ducted dehumidifiers — overview and selection guide →
DD Series — high capacity 140–960 L/day, three-phase →
DD-FX Series — Split System climate control with heating, cooling and humidification →
DEH-WP Series — wall- and floor-mounted, non-ducted →
DEH-1000P — mobile commercial unit, no installation →