18" x 12" Duct Tee with 8" x 8" Branch — $104.72
- Trunk: 18" x 12"
- Branch: 8" x 8"
- Gauge: 22 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 duct tee: 18" x 12" trunk with 8" x 8" branch, 22-gauge galvanized steel, slip-and-drive connections. Branch collar cut and riveted into the trunk.
18" x 12" Duct Tee with 8" x 8" Branch: sizing numbers
Worked out from this size's dimensions, so you can check it against your duct design before you order.
| Trunk free area | 1.50 sq ft (18" x 12") |
| Branch free area | 0.44 sq ft (8" x 8") |
| Branch share of trunk area | 30% |
| Trunk equivalent round duct | 16" diameter |
| Branch equivalent round duct | 8.7" diameter |
Airflow by velocity
| Air velocity | Trunk (1.50 sq ft) | Branch (0.44 sq ft) |
|---|---|---|
| 600 fpm | 900 CFM | 265 CFM |
| 700 fpm | 1,050 CFM | 310 CFM |
| 900 fpm | 1,350 CFM | 400 CFM |
| 1,200 fpm | 1,800 CFM | 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 18" x 12" tee with an 8" x 8" branch carry?
About 1,050 CFM at 700 fpm and 1,350 CFM at 900 fpm. The 18" x 12" trunk has 1.50 sq ft of free area, and airflow is free area times air velocity, so multiply 1.50 by the velocity your design calls for.
How much air does the 8" x 8" branch take from an 18" x 12" trunk?
The branch opening has 0.44 sq ft of free area, 30% of the trunk's 1.50 sq ft. At the same velocity in both, that is about 310 of every 1,050 CFM in the trunk at 700 fpm. The real split depends on the duct system downstream and on balancing dampers.
What gauge is an 18" x 12" tee with an 8" x 8" branch made in?
22-gauge galvanized steel. PMX picks the gauge from the distance around the largest opening: the 18" x 12" trunk is 60" around, and openings that measure over 54" up to 84" around are built in 22 gauge. The configurator on this page lets you choose 26, 24, 22 or 20 gauge and re-prices it.
How much does an 18" x 12" tee with an 8" x 8" branch cost?
$104.72 as configured on this page: 22-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 $165.65 in aluminum and $226.59 in stainless steel.
Can I order a duct tee 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 18" x 12" tee with an 8" x 8" branch 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 18" x 12" Duct Tee with 8" x 8" Branch configuration of our duct tee. 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.