Author Question: Foam is known as closed-cell because the air-trapping cells are sealed completely and tightly ... (Read 45 times)

lunatika · **on:** Jul 24, 2018

Foam is known as closed-cell because the air-trapping cells are sealed completely and tightly packed.

Indicate whether the statement is true or false

Question 2

The ________ is a group of materials that work together to keep the indoor environment separated from the outdoor environment.

A) Pressure boundary B) House as a system
C) Heat recovery system D) Building envelope