A multi-outlet plenum must divide one controlled airstream across several diffusers without creating excessive velocity, noise, imbalance or an installation layout that cannot fit the ceiling.
YONGFAN’s YF-MOA Multi-Outlet Distribution Plenums mate directly with YFVAV-S-T100 terminals, featuring internally lined acoustic sheet metal construction, six standard configurations (Types A–F), and configurable round spigot counts, positions and diameters to match any ceiling reflected plan.
One outlet may blow hard enough to cause occupant drafts while another barely delivers air. Air naturally follows the lower-resistance path, so differences in branch lengths or elbows cause flow imbalance even when total airflow matches the zone setpoint.
A second failure is outlet velocity: undersized round spigots create high dynamic pressure, excessive pressure loss, and regenerated air hiss.
A third failure is treating the plenum as zone control. Outlets sharing one YF-MOA belong to the same VAV control zone. If rooms need independent temperature setpoints, they require separate VAV terminals.
ASHRAE Room Air Distribution notes that poor inlet conditions create nonuniform discharge at air outlets. Coordinated outlet diameter, branch lengths and spigot positions ensure balanced throw and low room NC levels.
Spigot locations customized to the reflected ceiling plan keep flexible duct runs short, equal in length, and free of sharp bends.
Internal sound-absorbing liner attenuates terminal blade hiss and airflow turbulence before discharge into room diffusers.
Mates directly with YFVAV-S-T100 casing without transitions, saving ceiling height and eliminating field sheet-metal fabrication.
| Field | YONGFAN Documented Configuration |
|---|---|
Product type |
Single-inlet, multi-outlet distribution plenum |
Series |
YF-MOA |
Standard configurations |
Types A, B, C, D, E, F |
Inlet interface |
Matched to paired VAV terminal / YF-MOA-600 series body |
Outlets |
Round spigots with beaded collar for secure flexible duct clamping |
Outlet quantity |
Configured to order (e.g. 2, 3, 4, 5, 6 outlets) |
Outlet position & diameter |
Configured to order based on ceiling layout & airflow |
Casing construction |
Internally lined sheet-metal plenum (acoustic & thermal protection) |
Terminal pairing |
YFVAV-S-T100 |
Supply form |
Standalone matched plenum or factory-integrated terminal-plus-plenum assembly |
Final dimensions |
Set by paired terminal size and selected outlet configuration |
Submittal drawing |
Matched configuration drawing provided with quotation |
One YFVAV-S-T100 terminal controls total zone airflow (e.g. 1,600 m³/h), while YF-MOA splits air across four diffusers (~400 m³/h each).
Distributes conditioned air neatly along narrow architectural ceilings crowded with lights and sprinkler mains, eliminating complex takeoffs.
Handles changing occupancy airflow while internal lining and properly sized spigots ensure room NC 30 acoustic performance.
Custom spigot angles and positions prevent duct collisions with lighting tracks and suspended promotional displays.
Submitting your total zone airflow, paired VAV terminal model, diffuser count, spigot neck sizes, and ceiling clearance allows our factory to produce dimensioned layout drawings.
Fabricated using precision CNC punch and automated folding equipment to ensure tight casing joints and accurate spigot collars.
Factory adhesive application and mechanical pinning ensure acoustic insulation remains permanently bonded without erosion in high-velocity airflow.
Each plenum carries a unique serial number verifying custom drawing adherence, dimensional accuracy, and quality inspection sign-off.
All diffusers fed from a single YF-MOA receive airflow at the same supply temperature and respond to the same single VAV room thermostat.
If downstream flexible duct runs are significantly different in length, install manual volume dampers at diffusers to achieve fine balancing.
Always verify integrated terminal-plus-plenum length (1,000–1,100 mm) against available ceiling space before releasing fabrication drawings.
The YF-MOA takes one supply inlet from a paired VAV terminal and distributes that controlled airflow through several round outlet spigots to ceiling diffusers.
YONGFAN documents six standard configurations, Types A–F. Outlet quantity, position and diameter can also be customized to order.
The documented pairing is the YFVAV-S-T100 Single-Duct VAV Terminal, mating directly without separate sheet-metal transitions.
No. Final dimensions depend on the paired terminal size and the selected outlet arrangement. YONGFAN provides a matched configuration drawing with the quotation.
Yes. YONGFAN documents outlet quantity, location and diameter as configurable to order around lighting tracks and structural columns.
Yes. The YF-MOA uses an internally lined sheet-metal casing for acoustic damping and reduced condensation risk.
Yes. YONGFAN offers both a standalone matched plenum and an integrated terminal-plus-plenum configuration.
No. Several outlets downstream of one YFVAV-S-T100 remain part of the same upstream VAV control zone.
Connect zone airflow, paired VAV terminal size, diffuser count, spigot geometry, and ceiling void dimensions into one confirmed drawing. Send your ceiling layout to our application engineers.
