draft control vent, HVAC spec guide, aluminum air vent difference, 4-way vs 1-way air vent, MEP specification, HVAC design guide

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PRODUCT CLASSIFICATION

单层百叶风口
单双层百叶风口8
双层百叶风口16
双层百叶风口17
单层百叶风口
单双层百叶风口8
双层百叶风口16
双层百叶风口17

Double Deflection vs Single Deflection Grille: Which One Should You Specify?

PRODUCT DESCRIPTION:
  1. Direct HVAC Factory Pricing — No trading company markup. You buy double deflection grilles directly from our production line in China, with tiered pricing for 100 / 500 / 1000+ piece orders.

  2. Flexible MOQ for Every Buyer — Sample order as small as 10 pcs accepted for quality check; bulk project orders welcome. Whether you are a starter distributor or a global contractor, we scale with you.

  3. Fast Lead Time You Can Plan Around — Standard white sizes in stock ship within 7 days; custom orders delivered in 15–25 days. Rush production available for urgent project deadlines.

  4. Full OEM / ODM Support — Custom opening size, frame depth, blade pitch, RAL color, logo printing, barcoding and customer-specific packaging. We adapt to your warehouse and project system.

  5. CE / ISO9001 / ROHS Certified — Products meet EU and international HVAC standards. We are familiar with SASO/SABER (Middle East), SABS (South Africa) and other local certification requirements.

  6. 100% Pre-shipment QC, Defect Rate Below 0.5% — Every grille inspected on dimension tolerance, blade movement, coating thickness and frame flatness before packing. You receive exactly what you approved.

  7. Export-Standard Packaging for Sea Freight — Inner pearl foam bag + 5-layer corrugated carton with corner protection. No scratch, no dent, no moisture damage on arrival at your port.


Product Details

FactorSingle DeflectionDouble Deflection
Blades1 row (horizontal)2 rows (horizontal + vertical)
Air directionOne-way4-way / 360° adjustable
Best forReturn air, exhaust, fresh air intakeSupply air, draft-free comfort
Air throwShortLonger, better mixing
Price levelLowerSlightly higher
NoiseQuietQuiet (with OBD balancing)
Typical useReturn air shaft, bathroom exhaustOffice, hotel, mall supply outlet


Product Data

When to Choose Single Deflection

  • Return air grilles in return air shafts.

  • Bathroom, kitchen or storage exhaust vents.

  • Fresh air intake with insect screen.

  • Projects where budget is tight and directional control is unnecessary.

  • Sidewall return air in residential or light commercial.

When to Choose Double Deflection

  • Ceiling supply air outlets in offices and meeting rooms.

  • Hotel lobbies, guest rooms and conference halls.

  • Spaces where occupants sit or work directly under the vent (draft control critical).

  • Open-plan areas requiring longer air throw and better mixing.

  • Projects with strict acoustic and comfort specifications.


Inquiry Now

If you have any questions or needs about the product, please fill in the following form and we wll contact you as soon as possible.

+8615063068702

+8615063068702

ellin@cmdindustry.com

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