AirBox Comfort ventilation valve for PVC window. Montage. Trickle slot vent
http://air-box.eu/en Trickle vent is a device that allows air supply to rooms that use gravity ventilation, mechanical exhaust ventilation or hybrid ventilation. Even with the tight closed windows, the vents allow continuous air supply, in the amount according to the abiding regulations.
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AirBox ventilation valves for PVC windows. Fresh air trickle vents.
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