Any of the types of PVC pipe and fittings that are fastened together with solvent-based cement.
Soot pocket
Chimney flue bottom space where accumulated soot can be removed through a cleanout door.
Sooty mold
Several insect pests will release honey dew, which is a sticky substance that then mold grows on (thus the black coloring). Most associated with aphids. Use a soapy water solution to rinse off the insect pest.
Sound attenuators
Components which are inserted into the air distribution system and designed to reduce airborne noise which is propagated along the ducts.
Sound insulation
Material that resists the transmission of sound.
Sound rating number (srn)
Sound is measured in bels (a bel equals 10 decibels). The SRN of a unit is based on ARI test, performed at ARI standard rating conditions. Average sound rating range from 7.0 to 8.0 decibels. The lower the SRN rating, the quieter the unit.
Sound ratings
Although sound does not affect the efficiency of a unit, it will certainly affect your comfort. If your unit has a low sound level, you will hardly notice it is operating. But if it has a higher sound level, it may mean your good night's sleep is disturbed every time it runs!.
Sound transmission
The ability of a solid, gas or liquid to transmit sound.
Soundboard
Special board placed under the drywall (wallboard) to attempt to soundproof the wall.
Soundproof
(1) To insulate against sound transmission. (2) Something that is not affected by sound transmission.
