Holtop Ductless Single Room ERV features:
- Built-in CO₂ sensor adjusts airflow based on indoor air quality
- Up to 97% heat recovery with high-efficiency ceramic core
- Operates quietly at under 32.7 dB(A)
- Dual filters (pre-filter + F7/MERV 13) for cleaner air
- Easy indoor installation with a single wall opening
- Control via onboard button, remote, or smartphone app (Wi-Fi)
- App supports remote access, scene control, and group settings
- Quiet and energy-efficient EC fan (only 7.8W) with 3 speeds
- Free-cooling mode: increases fresh air when indoor and outdoor temperatures are similar
- Works alone or in pairs for flexible setups
- Built-in shutter prevents backdraft
- Frost- and condensation-free
- IPX4 water resistance
- Sleek decorative front panel
Is this a ductless ERV?
Yes. This is a ductless single room ERV designed for through-the-wall installation, making it a practical option for spaces where traditional ducted ventilation is not ideal.
How does this single room ERV work?
This unit works in alternating cycles. It exhausts stale indoor air, allowing the ceramic core to store heat, then switches to supply mode and brings in fresh outdoor air through that warmed core. This helps reduce heat loss while ventilating the room. The unit switches roughly every 75 seconds in regeneration mode.
What rooms is this ductless ERV suitable for?
This wall-mounted ERV is suitable for bedrooms, living rooms, home offices, condos, apartments, villas, hotels, cafés, and similar indoor spaces where fresh air ventilation is needed without installing full ductwork.
Does this ERV help with CO2 buildup in poorly ventilated rooms?
Yes. Rooms with poor ventilation, especially sealed condos and bedrooms, can build up CO2 over time. This unit continuously exchanges stale indoor air for fresh filtered outdoor air, and its built-in CO2 sensor automatically increases airflow when levels rise, helping keep the room's air quality balanced.
Does this unit help improve indoor air quality?
Yes. By bringing in filtered outdoor air and exhausting stale indoor air, the ductless ERV helps improve indoor air quality in single rooms while reducing the energy loss normally associated with simple exhaust-only ventilation.
How efficient is the heat recovery?
The heat recovery efficiency is up to 97%. Actual performance can vary depending on installation, speed setting, and room conditions, but the unit is designed to recover a high level of heat from outgoing air.
How loud is the unit?
The sound pressure level is 32.7 dB(A). This makes it a relatively quiet ventilation option for single rooms, though sound perception can still vary depending on where the unit is installed and the selected fan speed.
What is the airflow of the Holtop ductless single room ERV?
With the F7 filter installed, airflow in supply or exhaust mode is rated at 20 / 40 / 50 m³/h, which is about 11.8 / 23.5 / 29.4 CFM depending on fan speed. In boost mode, max airflow is rated up to 60 m³/h or 35 CFM.
What wall thickness does this ERV fit?
The adjustable wall sleeve is designed for wall thicknesses between 9.5in and 14.5in. This makes it suitable for a range of exterior wall assemblies.
What size is the duct opening?
The air duct diameter is 6.22in.
What power supply does it use?
This model is designed for 100 to 240V, 50/60 Hz power and is meant to connect directly to the socket.
