Zoro Homepage
Clipboard Icon Quick Order
Cart Icon 0 Cart
  1. Home
  2. /
  3. Heating & Cooling
  4. /
  5. Roof Ventilators
  6. /
  7. Belt Drive Centrifugal Exhaust Vents
  8. /
  9. Downblast Less Drive Package, 24-1/2In, Number of Speeds: 1
Dayton Downblast Less Drive Package, 24-1/2In, Number of Speeds: 1 4YU99 - main

Downblast Less Drive Package, 24-1/2In, Number of Speeds: 1

  • Mfr # 4YU99

  • Zoro # G1428856

product price: $1,854.99
/ea
Item requires special delivery charges. A $150.00 per item surcharge will be applied.

Key Features

Item - Roof Ventilators
Downblast Ventilator
Drive Package With Motor Included
No
Duty Rating - Roof Ventilators
Hazardous Location
Drive Type - Roof Ventilators
Belt Drive
Mounting Location - Roof Ventilators
Roof
See all product information
Get a 10% off coupon
Free 30-day returns
Return Policy
Get 30 days to pay with Net 30
Apply Now
Real support from real people
Contact our U.S. based team

Specifications

Product Information

MFR #
4YU99
Zoro #
G1428856
UPC #
190735339381
Country of Origin
United States

Dimensions

Base Size - Roof Ventilators
34 in x 34 in
Base Height
1.8 in
Wheel Dia.
24 1/2 in
Dimension D
5 3/4 in
Recommended Damper Size (In.)
27 x 27
Base Width
34 in
Overall Height
40 1/8 in
Dimension A
34 in
Overall Dia.
42 3/4 in
Base Length
34 in
Dimension C
38 3/8 in
Shaft Dia. Wheel End
1 in
Dimension B
42 3/4 in
Shaft Dia. Sheave End
1 in
Overall Width
38 3/8 in
Overall Length
42 3/4 in
Cutout Size
29.5 in L x 29.5 in W
Cutout Length
29.5 in
Wheel Diameter
24 in
Housing Length
42.8 in
Housing Width
42.8 in
Propeller Shaft Diameter
1 in
Overall Diameter
42 3/4 in
Damper Size
27 x 27 in

Details

Item - Roof Ventilators
Downblast Ventilator
Drive Package With Motor Included
No
Duty Rating - Roof Ventilators
Hazardous Location
Drive Type - Roof Ventilators
Belt Drive
Mounting Location - Roof Ventilators
Roof
Number of Speeds
1
Recommended Damper Stock No.
4HX68
Adj. 12 3/8"H Roof Curb Stock No.
2ZV84
Wheel Type
Backward Inclined
Wheel Material
Aluminum
Bearing Type
Regreasable Pillow Block
Motor HP Range
1/4 to 3
CFM Range
4223 to 8355 @ 0.0 in SP
Requires
Roof curb for new installations
Housing Material
Aluminum
Max. Inlet Temp.
180 Degrees
Includes
NEMA 1 Junction Box
RPM Range
460 to 910
Recommended 8 In. Fixed Curb Item No.
4HX42
Item
Centrifugal Downblast Roof Exhaust Fan
Recommended 12 In. Fixed Curb Item No.
2RB80
Adj. 6 3/8"H Roof Curb Stock No.
4c455
Mounting Location
Roof
Drive Type
Belt Drive
Standards
AMCA Sound and Air, UL/cUL 705
Speed Controllable
No
Features
Air Handling Quality Bearings Meet Minimum of L10-100,000 Hours, Features a Fully Rolled Windband Bead for Increased Stability and Easy Transport, Fresh Outside Air is Drawn in Under the Motor Cover to Maximize Motor Life, Nema 1 Junction Box Located in Motor Enclosure, Nonoverloading Centrifugal Wheel Design, Optional Nema 1 and 4 Disconnects Available
Application
Industrial and Commercial Buildings
For Air Type
Clean Air
Assembly
Unassembled
Housing Material Fabrication
Spun
Maximum Inlet Air Temperature
180 Degrees F
Includes Motor
No
Maximum Static Pressure
1 1/2 in wc
Noise Level @ 0.000 in SP @ 5 ft
6.7 sones
Minimum Airflow
2,036 cfm
Power Source
Electric Motor
Includes Drive Package
No
Spark Resistant Construction Type
A
Base Shape
Square
Safety Features
Birdscreen, Windband
Minimum Motor Horsepower
1/4 hp
Maximum Fan Speed
910 RPM
Compatible Curb Manufacturer Part Number
2RB80, 2ZV84, 3C438, 4C455, 4HX42, 4HX50
For High-Static Pressure Applications
No
Sound Level
Fan RPM 460: 6.7 sones @ 0.000 in SP and 5 ft, 6.6 sones @ 0.125 in SP and 5 ft, 5.7 sones @ 0.250 in SP and 5 ft, 4.2 sones @ 0.375 in SP and 5 ft, Fan RPM 505: 7.8 sones @ 0.000 in SP and 5 ft, 7.5 sones @ 0.125 in SP and 5 ft, 6.9 sones @ 0.250 in SP and 5 ft, 6.1 sones @ 0.375 in SP and 5 ft, Fan RPM 585: 10.3 sones @ 0.000 in SP and 5 ft, 9.7 sones @ 0.125 in SP and 5 ft, 9.1 sones @ 0.250 in SP and 5 ft, 8.8 sones @ 0.375 in SP and 5 ft, 8.2 sones @ 0.500 in SP and 5 ft, 7.2 sones @ 0.625 in SP and 5 ft, Fan RPM 660: 13.1 sones @ 0.000 in SP and 5 ft, 12.4 sones @ 0.125 in SP and 5 ft, 11.8 sones @ 0.250 in SP and 5 ft, 11.3 sones @ 0.375 in SP and 5 ft, 11.0 sones @ 0.500 in SP and 5 ft, 10.6 sones @ 0.625 in SP and 5 ft, 10.4 sones @ 0.750 in SP and 5 ft, Fan RPM 730: 15.8 sones @ 0.000 in SP and 5 ft, 15.0 sones @ 0.125 in SP and 5 ft, 14.3 sones @ 0.250 in SP and 5 ft, 13.8 sones @ 0.375 in SP and 5 ft, 13.4 sones @ 0.500 in SP and 5 ft, 13.1 sones @ 0.625 in SP and 5 ft, 12.9 sones @ 0.750 in SP and 5 ft, 12.7 sones @ 0.875 in SP and 5 ft, Fan RPM 825: 19.7 sones @ 0.000 in SP and 5 ft, 18.6 sones @ 0.125 in SP and 5 ft, 17.7 sones @ 0.250 in SP and 5 ft, 17.2 sones @ 0.375 in SP and 5 ft, 16.8 sones @ 0.500 in SP and 5 ft, 16.4 sones @ 0.625 in SP and 5 ft, 16.2 sones @ 0.750 in SP and 5 ft, 15.6 sones @ 0.875 in SP and 5 ft, 14.8 sones @ 1.000 in SP and 5 ft, Fan RPM 910: 24.0 sones @ 0.000 in SP and 5 ft, 23.0 sones @ 0.125 in SP and 5 ft, 21.0 sones @ 0.250 in SP and 5 ft, 21.0 sones @ 0.375 in SP and 5 ft, 21.0 sones @ 0.500 in SP and 5 ft, 20.0 sones @ 0.625 in SP and 5 ft, 19.6 sones @ 0.750 in SP and 5 ft, 19.4 sones @ 0.875 in SP and 5 ft, 19.2 sones @ 1.000 in SP and 5 ft, 16.7 sones @ 1.250 in SP and 5 ft, 13.6 sones @ 1.500 in SP and 5 ft
Mount Type
Roof Curb
Electrical Connection
Power Cord
Maximum Motor Horsepower
3 hp
Maximum Airflow
8,355 cfm
Motor Location
Out of Airstream
Resistance Properties
Weather Resistant
Minimum Motor Speed
460 RPM
Maximum Motor Speed
910 RPM
Brake Horsepower
13/50 hp

Description

Centrifugal Downblast Roof Exhaust Fan, Drive Type Belt Drive, Assembly Unassembled, Mounting Location Roof, Wheel Diameter 24 in, Base Diameter Not Applicable, Base Length 34 in, Base Width 34 in, Base Shape Square, Minimum Airflow 2,036 cfm, Maximum Airflow 8,355 cfm, Maximum Motor Horsepower 3 hp, Minimum Motor Horsepower 1/4 hp, Minimum Motor Speed 460 RPM, Maximum Motor Speed 910 RPM, Maximum Static Pressure 1 1/2 in wc, For High-Static Pressure Applications No

Ratings & Reviews

3 Reasons You Can Count On Us

  • Supplies for every job.

    Supplies for every job.

    10 million items and the exact one you need.

  • When you need it fast, count on Zoro!

    When you need it fast, count on Zoro!

    2 million products ship in 1 day.

  • Stretch your budget further.

    Stretch your budget further.

    Everyday low prices on the brands you love.

Explore More Products