https://greenlifenutrition.org/relief-hemp-cbd-oil/

RELIEF HEMP CBD Oil  Is there adequate combustion air for a standard gas or oil furnace? Most of the furnaces we observe are standard gas or oil, forced-air, down-flow style. The make-up (combustion) air source is usually from under the trailer, excepting newer installations of direct-vent furnaces.Is there adequate ductwork? In some mobile mobile homehomes the original configuration provided for supply and return air only at the furnace closet door. Much of the retrofit ducting is flex-duct, and may be damaged or deteriorated under the unit.   https://greenlifenutrition.org/relief-hemp-cbd-oil/