Cellulose insulation and the process of weatherizing and insulating a building involves a number of technical terms and concepts. We've compiled this glossary to help you decipher them.
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A blower door is a tool used by an Energy Auditor which lowers the air pressure inside a building, allowing outside air to flow in through all unsealed cracks and openings.
Blower doors consist of a frame and flexible panel that fits in an exterior doorway, a variable-speed fan, a pressure gauge to measure the pressure differences inside and outside the home, and instruments for measuring airflow.
Blower doors are either calibrated or uncalibrated. The latter can only locate leak paths in a home, but canâ€™t measure the overall tightness of the building, expressed in air exchanges per hour. Use of a calibrated blower door is preferred, and will provide data that quantifies the amount of air leakage and the effectiveness of air-sealing.
Borate is a naturally occurring mineral additive used to give cellulose insulation its Class A fire rating. The borate, as fine as sugar at the start of the manufacturing process, is further milled to a particle size comparable to smoke, and is infused in the cellulose fiber. National Fiber uses an all-borate formulation, as opposed to a borate/ammonium sulfate mix.(See Ammonium Sulfate
The gradual loss in intensity of any kind of flux through a medium. Examples: sunlight is attenuated by dark glasses, X-rays are attenuated by lead and sound is attenuated by dense-packed cellulose insulation.