8" x 8" x 48" Straight Rectangular Duct — $71.36
- Width: 8"
- Depth: 8"
- Length: 48"
- 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 8" wide x 8" deep straight rectangular duct, 48" long, in 24-gauge galvanized steel with slip-and-drive connections on both ends. Pittsburgh-locked seam, made to order in Pittsburgh.
8" x 8" x 48" Straight Rectangular Duct: sizing numbers
Worked out from this size's dimensions, so you can check it against your duct design before you order.
| Free area | 0.44 sq ft (64 sq in) |
| Perimeter | 32" |
| Equivalent round duct (equal friction) | 8.7" diameter |
| Equal-area round duct | 9" diameter |
| Aspect ratio | 1 : 1 |
| Sheet metal in the walls | about 10.7 sq ft |
| Approximate sheet weight | about 12 lb (24-gauge galvanized at 1.156 lb per sq ft, before seams and connectors) |
Airflow by velocity
| Air velocity | Duct (0.44 sq ft) |
|---|---|
| 600 fpm | 265 CFM |
| 700 fpm | 310 CFM |
| 900 fpm | 400 CFM |
| 1,200 fpm | 535 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 does an 8" x 8" rectangular duct carry?
About 310 CFM at 700 fpm and 400 CFM at 900 fpm. An 8" x 8" duct has 0.44 sq ft of free area, and airflow is free area times air velocity, so multiply 0.44 by the velocity your design calls for.
What round duct is equivalent to an 8" x 8" rectangular duct?
About 8.7" 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 (0.44 sq ft) is 9".
What gauge is an 8" x 8" rectangular duct made in?
24-gauge galvanized steel. PMX picks the gauge from the distance around the largest opening: an 8" x 8" duct is 32" 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 an 8" x 8" rectangular duct cost?
$71.36 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 $110.36 in aluminum and $149.36 in stainless steel. In galvanized steel, the 60" long version is $76.86.
Can I order a straight duct 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 an 8" x 8" rectangular duct 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 8" x 8" x 48" Straight Rectangular Duct configuration of our straight rectangular duct. 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.