LITTLE KNOWN FACTS ABOUT SECONDARY GLAZING LONDON.

Passive wall air flow - This permits refreshing air right into a room by way of a small hole from the wall. Isn't going to need a power offer and will be located wherever in a space. Much less obtrusive and more controllable than window vents.Also, the soundproofing furnished by the vacuum-like hole can noticeably lessen outdoor sound, boosting the