Air-Box Window Trickle Vent-Installation without drilling

– fits to be installed to any plastic profile
– no need to open the window to ventilate the room
– no street noise and air drafts
– Manual adjustment of air feed volume
– Note! The installation of the window vent flapper does not require changes in profile. There is no need to drill a window!!!

The principle of functioning:

Fresh air from outside enters the channel between the frame and the sash in place of replacement of a fragment from typical seal to a special one.

Then the air goes through a valve mounted on top of the flap and enters the room.

Pls contact us for price and large quantities.