The furnace fan produces high pressure in the supply ducts and low pressure in the return ducts. The high-pressure forces warm air from the supply ducts to flow into the rooms; low pressure draws room ...

A similar options is a jumper duct, which uses ductwork to connect a room without a return to the common area where the central return is located. Having an HVAC professional install additional ...

The return ductwork draws ambient temperature air back to the furnace or A/C unit to repeat the cycle. Duct Sizing. Properly sized ducts ensure good airflow coverage. Oversized ducts let air zoom ...

Heating, ventilation, and air conditioning (HVAC) ... which can create further fire entering the ductwork or the plenum space. A return air plenum is one of the biggest concerns for firefighters.

As air moves through the ducts, it interacts with surfaces. The smoother the duct, the more easily air can move throughout it. “Let’s say your return side is designed to be 10 inches in diameter, and ...

“Covering up or blocking return air vents, where the system draws in the air, inside the home is another common problem we see. These things can be like asking your system to work harder while ...

In both overhead and under-floor methods, return air ducts have to be sized to deliver the air at a velocity not exceeding 300ft/min. Also, the placement of return air ducting is crucial. Don't locate ...

But some HVAC systems have filters inside the return air ducts scattered in multiple rooms throughout your home. (Those are the grates that suck air back in, rather than blowing air out.) ...