Open Spaces as Return-Air Options - Code Notes Stud cavities and floor joist spaces are often used to return air to the heating, ventilating, and air conditioning (HVAC) system#s air-handler, and are specifically allowed in the I-codes. Field testing shows that these return systems are often extremely leaky.
Q&A / Cold Air Return Heating Design | New Construction text: Tim Carter. DEAR TIM: We live in a Cape Cod style house that was built in the early 1960's. The problem is that in the summer the basement is cold, the main floor is comfortable, and the upstairs is hot.
The one return up and one return down is simply a 'cost-cutting' way to provide cold air return. There ideally should be a corresponding cold air return for every supply with the exception of bathrooms and kitchens. In other words, there should be a cold air return in each bedroom, living room, family room, dining room, etc. (with noted ...
A cold-air return is a vent that sucks cold air into a furnace so that it can be heated and brought back to a room through a furnace register. These vents are seen in many types of furnace systems, although there are alternatives, such as drawing air from the outside or from the area around the furnace.
Cold-Air Returns - Be More Comfortable. Static Pressure In Supply & Return Ducts Is Important. Existing Hot Houses - Check Return Air Duct. If you live in a home that has rooms that are either too hot in hot weather or are cold in cold weather you could have a return-air duct issue. Return air ducts are necessary for just about every room.
Would this apply to cold air returns as well. We very seldom see heat registers near the top of the wall ceiling intersection where the smoke alarms are located. Some of the installation manuals state 3' from a supply or cold air register. We are having a general discussion on whether this distance separation would apply to cold air registers also.
The exception to 300.22(C) permits cable to pass through joist or stud spaces of a dwelling unit. The joist space is covered with sheet metal and used as a cold-air return for a forced warm-air central heating system. Equipment such as junction boxes or device enclosures is not permitted in this location.
Place your cold air return vents on the inside walls of buildings at the lowest point. The return vent pulls cold air from the bottom of the room and returns it to the furnace to be reheated and returned as warm air. Unlike supply vents, return vents do not need to be cased in metal.
As per code you need a cold air return. This is as easy as extending an existing cold air duct into a stud space, sealing it up with aluminum tape, then cutting a grille at the bottom near the floor.
To explain the components of a forced air system: a fan draws air from the house into the system through return air vents (Image 1). During cold weather, gas burners create heat in the heat exchanger (Image 2), which in turn heats the air.