Author Question: Gas pressure should be checked at the rooftop valve prior to installation. The gas line pressure for ... (Read 167 times)

sdfghj · **on:** Jul 24, 2018

Gas pressure should be checked at the rooftop valve prior to installation. The gas line pressure for natural gas in inches of water column should not exceed:

A) 3.5 in WC. B) 5.0 in WC. C) 10.5 in WC. D) 2 psi.

Question 2

To ensure that the rafters or joists do not interfere with installation of the plenums on a curb-mounted rooftop unit:

A) The roof curb must be square with the roof joists or rafters.
B) The roof curb must be installed diagonal to the roof joists or rafters.
C) The roof joists or rafters are cut out where the curb is installed.
D) The plenums are fabricated in place with the roof joists or rafters passing through them.