Floor Joist Panning

Master flow 16 in.

Floor joist panning.

Female end allows interlocking of multiple pieces for long runs. It can be cut to size to suit a variety of applications. So far the only option i have found was to use hard pipe. Using floor joists as return ducts by panning can cause leakage because negative pressure in the cavity will draw air from the outside into the cavity through the construction joints of the rim area at the end of the joist cavity.

However a have read in a few places that joist panning is difficult to seal and can pull air from unconditioned spaces. I am looking for an alternative to replace joist panning that is easier to seal and better all around. One is the pan joist system a standardized beam and girder system of constant depth formed with prefabricated sheet metal forms. Still commonly used is the panned floor joist.

It also can be nailed on the bottom of floor joists to convert floor joist cavities to a duct run. This product is proudly made in the usa using galvanized steel construction for durability and rust prevention. Joist panning can be installed between wall studs to enclose the stud cavity creating a duct run. Joist panning lining seems to still be popular.

This panning is constructed with sturdy 30 gauge galvanized steel. Other articles where pan joist system is discussed. A two way version of pan joists called the waffle slab uses prefabricated hollow sheet metal domes to create a grid pattern of voids in a solid floor slab saving.