12" x 8" Return Air Boot — $48.10
- Width: 12"
- Depth: 8"
- Gauge: 24 ga
- Material: Galvanized Steel
- Connections: Slip & drive
- Fabrication: Made to order in Pittsburgh, PA
- Lead time: Ships in 1 business day
- Returns: Made to order, not returnable
Custom fabricated 12" x 8" return air boot in 24-gauge galvanized steel with slip-and-drive connections. Transitions a return grille to the return trunk. Made to order.
12" x 8" Return Air Boot: sizing numbers
Worked out from this size's dimensions, so you can check it against your duct design before you order.
| Free area | 0.67 sq ft (96 sq in) |
| Perimeter | 40" |
| Equivalent round duct (equal friction) | 10.7" diameter |
| Equal-area round duct | 11.1" diameter |
| Aspect ratio | 1.5 : 1 |
Airflow by velocity
| Air velocity | Opening (0.67 sq ft) |
|---|---|
| 300 fpm | 200 CFM |
| 400 fpm | 265 CFM |
| 500 fpm | 335 CFM |
| 600 fpm | 400 CFM |
Airflow is free area times air velocity. Pick the row that matches the velocity your design uses; these figures are capacity at that velocity, not a pressure-loss calculation.
Questions about this size
How many CFM can a 12" x 8" return air boot handle?
About 265 CFM at 400 fpm and 335 CFM at 500 fpm through its 0.67 sq ft opening. Return openings are sized at lower velocities than supply ducts to keep grille noise down, and the grille's own free area is smaller than the opening, so check the grille maker's data.
What round duct is equivalent to a 12" x 8" return boot?
About 10.7" round. That is the equal-friction equivalent diameter, 1.30 x (a x b)^0.625 / (a + b)^0.25, the round size that carries the same airflow at the same friction loss. The round duct with the same free area (0.67 sq ft) is 11.1".
What gauge is a 12" x 8" return air boot made in?
24-gauge galvanized steel. PMX picks the gauge from the distance around the largest opening: a 12" x 8" opening is 40" around, and openings that measure over 30" up to 54" around are built in 24 gauge. The configurator on this page lets you choose 26, 24, 22 or 20 gauge and re-prices it.
How much does a 12" x 8" return air boot cost?
$48.10 as configured on this page: 24-gauge galvanized steel, made to order. The price comes from the same quoting engine that prices the cart, and changing any dimension in the configurator re-prices it. The same size is $87.10 in aluminum and $126.10 in stainless steel.
Can I order a return air boot in a different size?
Yes. This page is one published size; the configurator above is loaded with these dimensions and every one of them can be changed to the size you measured, in galvanized steel, aluminum or stainless steel. Each fitting is cut and formed for the order in Pittsburgh, PA.
How fast does a 12" x 8" return air boot ship, and can it be returned?
It ships in 1 business day from our Pittsburgh, PA shop, by UPS or by LTL freight for large orders, anywhere in the continental US. Shipping is calculated at checkout from the order's weight and destination. Because it is made to the dimensions you order, it is not returnable.
About this size
This page is the 12" x 8" Return Air Boot configuration of our return air boot. It is cut and formed for this order — nothing here is a stock import part. The configurator above is loaded with these exact dimensions, so you can add it to the cart as-is, or change a dimension and it re-prices instantly.