| Item No: | Nominal Size | Size (Duct Opening) | Model | Slots | Neck Size | Actual Size | Material | Outer Dimensions | Color | Airflow Direction | Bulk Pricing | Order | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2-10 | 11-20 | 21-49 | 50+ | 100+ | ||||||||||||
| 410101-4 | 12" Neck | Steel | 15-15/16" | White | $21.29 | $20.23 | $19.59 | $18.95 | $18.10 | ||||||||
| 410101-6 | 6" Neck | Steel | 9-15/16" | White | $17.99 | $17.10 | $16.56 | $16.02 | $15.30 | ||||||||
| 410101-1 | 10" Neck | Steel | 13-15/16" | Black | $30.59 | $29.07 | $28.15 | $27.23 | $26.01 | ||||||||
| 410101-5 | 6" Neck | Steel | 9-15/16" | Black | $17.99 | $17.10 | $16.56 | $16.02 | $15.30 | ||||||||
| 410101-2 | 10" Neck | Steel | 13-15/16" | White | $16.19 | $15.39 | $14.90 | $14.41 | $13.77 | ||||||||
| 410101-8 | 8" Neck | Steel | 11-15/16" | White | $23.29 | $22.13 | $21.43 | $20.73 | $19.80 | ||||||||
| 410101-3 | 12" Neck | Steel | 15-15/16" | Black | $34.69 | $32.96 | $31.92 | $30.88 | $29.49 | ||||||||
| 410101-7 | 8" Neck | Steel | 11-15/16" | Black | $23.39 | $22.23 | $21.52 | $20.82 | $19.89 | ||||||||
Steel Round Diffusers
Steel round diffusers connect directly to round duct on the ceiling, spreading conditioned air outward from a round face instead of a rectangular one. Within the Round Ceiling Diffusers & Dampers range, AirGrilles stocks the diffuser in 2 colors, black and white, in 4 neck sizes, 6, 8, 10, and 12 inches, sold without a butterfly damper. The heavy-duty steel face wears a powder-coated finish, and a Steel Butterfly Damper sold separately handles the volume control for rooms that need it. Bulk pricing runs across 6 quantity tiers with savings up to 30%, orders of 500+ units qualify for custom production, and in-stock items ship the same day on orders placed by 11AM ET.
A Round Diffuser Without a Built-In Damper
Steel round diffusers connect to round duct through a neck sized to match the duct, spreading air outward from the ceiling instead of throwing it in one direction. Within the Round Ceiling Diffusers & Dampers range, the diffuser ships without a damper built into the face, so volume control is a separate purchase rather than a fixed part of the unit. The heavy-duty steel construction holds its shape on ceiling installs, and the powder-coated finish resists the scuffs and corrosion overhead moisture can cause. Once the neck size matches the duct, the diffuser mounts directly without additional hardware.
Pairing a Round Diffuser with a Butterfly Damper
A round diffuser alone spreads air but does not control the volume, since the face has no built-in damper. Steel Butterfly Dampers install in the same duct run behind the diffuser, with a plastic key-handle that opens and closes the blade to set the airflow. Ordering the diffuser and the damper as two separate parts lets a room use a diffuser alone where volume control is not needed, or add the damper where it is. Match the damper's neck size to the diffuser's neck size before ordering either.
Neck Sizes, Colors, Bulk and Custom Orders
Round diffusers are ordered by neck size, the diameter of the round duct connection, rather than a width-by-height duct opening. AirGrilles stocks 4 neck sizes, 6, 8, 10, and 12 inches, in black and white powder-coated steel. Check each product listing for the face diameter that pairs with the neck size, since the face runs larger than the duct connection itself. Bulk pricing spans 6 quantity tiers, from 1 unit to 100+, with savings up to 30% at the higher tiers. Orders of 500+ units qualify for custom production depending on size, finish, and lead time, and in-stock items ship the same day on orders placed by 11AM ET.
Common Questions About Steel Round Diffusers
These answers cover the damper, sizing, material, and ordering questions that come up most on steel round diffusers.
Does a round diffuser include a damper?
No, steel round diffusers ship without a built-in damper, so the face alone spreads air with no volume control. Add a butterfly damper separately for rooms that need airflow adjustment. Check the product title to confirm whether a listing includes a damper.
How do I size a round diffuser?
Measure the round duct's diameter and match it to the closest neck size, 6, 8, 10, or 12 inches. The visible face runs larger than the neck size itself, so check the face diameter on each product listing. Neck size, not the face diameter, is the number to match against the duct.
What if the room needs a square or rectangular diffuser instead?
Square Ceiling Diffusers spread air from a square face instead of a round one, for ceiling openings that are not connected to round duct. Round diffusers only fit a round duct connection at the listed neck size. Match the product to the duct shape before choosing a size.
What colors do steel round diffusers come in?
The range ships in black and white, both finished with a powder coat baked onto the steel. White blends into most ceiling colors, and black suits dark architectural ceilings. Check the product listing for the latest color availability by neck size.
Where do round diffusers fit in the wider ceiling range?
Round diffusers are one of several ceiling air outlet types AirGrilles stocks; the full ceiling diffusers range also covers square, linear slot, and T-bar drop-ceiling styles. Choose round diffusers specifically for round duct connections. Match the product to the ceiling type and the duct shape before ordering.
Is there a bulk discount on round diffusers?
Yes, bulk pricing applies automatically across 6 quantity tiers, with savings up to 30% at the 50+ tier. Orders of 500+ units qualify for custom production depending on size, finish, and lead time. In-stock items ship the same day on orders placed by 11AM ET.
- Choosing a selection results in a full page refresh.