18" x 12" to 10" x 8" Duct Transition, 8" Long — $77.58
- Inlet: 18" x 12"
- Outlet: 10" x 8"
- Length: 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 transition from 18" x 12" down to 10" x 8" over 8", 22-gauge galvanized steel, slip-and-drive both ends. Made to order.
18" x 12" to 10" x 8" Duct Transition, 8" Long: sizing numbers
Worked out from this size's dimensions, so you can check it against your duct design before you order.
| Inlet free area | 1.50 sq ft (18" x 12") |
| Outlet free area | 0.56 sq ft (10" x 8") |
| Outlet area as a share of inlet | 37% |
| Velocity change, inlet to outlet | x 2.70 |
| Reduction over the 8" body | 8" on the width, 4" on the depth |
| Inlet equivalent round duct | 16" diameter |
| Outlet equivalent round duct | 9.8" diameter |
Airflow by velocity
| Air velocity | Inlet (1.50 sq ft) | Outlet (0.56 sq ft) |
|---|---|---|
| 600 fpm | 900 CFM | 335 CFM |
| 700 fpm | 1,050 CFM | 390 CFM |
| 900 fpm | 1,350 CFM | 500 CFM |
| 1,200 fpm | 1,800 CFM | 665 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 much does the air speed up through an 18" x 12" to 10" x 8" transition?
The outlet has 37% of the inlet's free area (0.56 sq ft against 1.50 sq ft), so the same airflow leaves about 2.70 times faster than it enters. At 900 fpm in the outlet the fitting is carrying 500 CFM, and the inlet side is moving at about 330 fpm.
How steep is the taper on an 18" x 12" to 10" x 8" transition that is 8" long?
The width closes by 8" and the depth by 4" over the 8" body. Centred, the steeper pair of sides slopes about 27 degrees each; built flat on one side, the sloped side runs about 45 degrees. A longer body gives a gentler taper and a lower pressure loss.
What gauge is an 18" x 12" to 10" x 8" transition made in?
22-gauge galvanized steel. PMX picks the gauge from the distance around the largest opening: the 18" x 12" inlet 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" to 10" x 8" transition cost?
$77.58 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 $126.33 in aluminum and $175.08 in stainless steel. In galvanized steel, the 12" long version is $82.58.
Can I order a duct transition 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" to 10" x 8" transition 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" to 10" x 8" Duct Transition, 8" Long configuration of our duct transition. 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.