pressurization

Return-Air Problems

Posted on April 01,2015 by user-756436 in commissioning

In homes with a single central return-air grille, return air often struggles to find its way back to the furnace. The result: room-to-room pressure imbalances that lead to uneven room temperatures, comfort complaints, higher energy costs, and even moisture problems in walls and ceilings.

Pinpointing Leaks With a Fog Machine

Posted on April 01,2015 by user-756436 in air sealing

In the last few years, energy consultants have developed a quick and easy way to pinpoint air leaks in a building envelope. The technique uses a theatrical fog machine — a small, inexpensive device that creates smoke-like fog for dances, Halloween parties, or theatrical events. Fog machines have heating elements that vaporize “fog juice,” a solution of water and glycol or water and glycerin. With the help of a blower door or a window fan, a fog machine can dramatically reveal holes in a building envelope.

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