What is Draft

What is draft? Draft is important to combustion efficiency and safe combustion. If draft isn’t adequate, chimneys can backdraft or spill.  We measure draft between between two places in a combustion heating system. For example, we measure draft between the a...

LBNL “Smart Ventilation” Research

Lawrence Berkeley National Lab (LBNL) scientists, led by Max Sherman and Iain Walker, are investigating whole-house ventilation options to support California’s Zero Net Energy Homes initiative. This research project is called Smart Ventilation for Advanced...

Sliding Glass Doors: Comfort and Energy

Sliding glass door heat flow A sliding glass door’s large expanse of glass transmits a lot heat out of the home in the winter and into the home in summer. This heat flow takes three forms: heat conducts directly through the glass in winter, solar heat transmits...

Attic Vents and Venting – Part 1

Attic vents and roof venting serve a variety of purposes, depending on roof design and climate. These purposes include preventing ice damming, drying building materials, and controlling solar heat gain. In cold climates, we want to avoid ice damming by keeping the...