Refer to the office and warehouse plans. With return air in a common plenum, it should be verified that: I. The return air plenum is constructed entirely of non- combustable materials. II. The HVAC units combination o f controls

Refer to the office and warehouse plans. With return air in a common plenum, it should be verified that: I. The return air plenum is constructed entirely of non- combustable materials. II. The HVAC units combination o f controls