What is a plenum adapter?
More specifically, a plenum adapter can allow you to do the following: Fit a 17.5-inch-wide coil 14-inch-wide furnace. Fit a 21-inch-wide coil with a 17.5-inch-wide furnace. Fit a 24.5-inch-wide coil with a 21-inch-wide furnace.
How do I size a furnace plenum?
Proportion the air to the square footage of the areas served. Thus if the home had 1200 sq ft of conditioned space, figure 1 sq ft per sq ft of floor space. A bedroom with 160 sq ft of floor area would get 160 cfm. The branch duct would be sized to handle that much air at 500 to 600 fpm velocity.
What size plenum do I need?
One is that the supply plenum should be no larger than the blower opening off the top of the air handler, which seems small, at only 16×11″. But most opinion, particularly from the HVAC supplier, is that the plenum should be the same size as the overall A.H. cabinet size, which is 17.5 x 21″.
Why plenum box is used?
Plenum boxes are used for supply and exhaust of air through diffusers and grilles. The plenum box ensures a continuous flow to the diffuser, and plenum boxes equipped with dampers create the possibility of adjusting the diffuser on an individual level.
How do you seal a plenum?
For long-term results, seal the plenum with aluminum tape, not ordinary duct tape. Duct tape is backed with an adhesive which is broken down by thermal cycling (repeated cycles of warmer and cooler temperatures — exactly what you will get in an HVAC system).
How big should my supply plenum be?
2 x 40 or 80 inches would be the length of the plenum. There would be no branch connections at any point in the box that is less than 16 inches from the entrance side. Minimum recommended size is 2 x 16 or 32 inches; length is 1 x 36 or 36 inches.
Should the plenum be insulated?
Supply and return air ducts and plenums shall be insulated with a minimum of R-6 insulation where located in unconditioned spaces and where located outside the building with a minimum of R-8 insulation in Climate Zones 1 through 4 and a minimum of R-12 insulation in Climate Zones 5 through 8.
Can a supply plenum be too big?
How big should a plenum be?
