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Plenums & Air Boxes

Galvanised steel plenum boxes and return air boxes for duct-to-diffuser transitions. Available in dozens of size configurations for residential and commercial HVAC.

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Galvanised steel bodyMultiple neck sizesTop / Side / Rear entryStandard & custom configsFilter-ready return boxes

5 products

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Supply Air Plenum

Supply Air Plenum in Galvanised Steel finish. Available in 10 sizes from 1060×180 2×14 to 925×255 3×14. Custom sizes available.

Finish: Galvanised SteelSKU Count: 10Size Range: 1060×180 2×14 — 925×255 3×14
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Supply Air Plenum

Supply Air Plenum in Galvanised Steel finish. Available in 8 sizes from 1070×300 2×14 to 900×350 3×14. Custom sizes available.

Finish: Galvanised SteelSKU Count: 8Size Range: 1070×300 2×14 — 900×350 3×14
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Supply Air Plenum

Supply Air Plenum in Galvanised Steel finish. Available in 4 sizes from 1030×270 2×14 to 1030×340 3×14. Custom sizes available.

Finish: Galvanised SteelSKU Count: 4Size Range: 1030×270 2×14 — 1030×340 3×14
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Supply Air Plenum

Supply Air Plenum in Galvanised Steel finish. Available in 16 sizes from 1170×220 2×12 to 820×220 3×10. Custom sizes available.

Finish: Galvanised SteelSKU Count: 16Size Range: 1170×220 2×12 — 820×220 3×10
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Return Air Box

Return Air Box in Galvanised Steel finish. Available in 72 sizes from RETURN AIR BOX 1000×400 2×14" to RETURN AIR BOX 900×600 2×16". Custom sizes available.

Finish: Galvanised SteelSKU Count: 72Size Range: RETURN AIR BOX 1000×400 2×14" — RETURN AIR BOX 900×600 2×16"
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Need custom plenums?

OEM manufacturing, custom dimensions, private labeling. Quote within 12 hours.

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Frequently Asked Questions

What is the MOQ for plenums & air boxes?
Standard items start at 100–500 pieces. Custom or OEM orders usually require 500–2,000 pieces. Contact us for exact pricing.
Do you offer OEM/ODM for plenums & air boxes?
Yes. Custom dimensions, materials, finishes, and packaging. We have been an OEM partner for global HVAC brands for 20+ years.
What is the lead time for plenums & air boxes?
Standard items: 15–25 business days from China. Custom/OEM: 30–45 days. US spiral ducts: 5–10 days from Houston, TX.
What certifications do your plenums & air boxes have?
UL, CE, M1, ROSH, and AWTA depending on the product line. View certifications.