Diversfied Fall Protection 24400 Sperry Drive (440) 348-946024400 Sperry Drive Cleveland, OH 44145 (440) 348-9460 www.unistrutohio.com

HVAC Duct Supports

Non-penetrating, 38lb, concrete bases with rubber

pad prevents roof leaks

Pre-engineered to comply with ASCE7/SBC wind

loading building code requirements

12 GA. pre-galvanized (ASTM A653) and hot-

dipped galvanized (ASTM A123) standard finishes

Adjustable height

Made in the USA

Wind Load Rated @ 120 MPH

Design Factors:

The snow loading is based on the geographical area and duct/pipe shape.

The wind loading is on the duct/pipe is determined in two (2) steps.  First, ultimate wind pressure is determined based on wind direction, exposure category, topographic factor and velocity pressure exposure coefficient. Then the effective wind pressure on the duct/pipe is then calculated, based on the gust factor and net force coefficient.  

(Wind Loads act as a control over seismic loads) Ultimate Wind Speed, 3 Second Gust- 120 MPH (ASCE7-16) Design Height- 15 feet. Building Classification Category- II. Wind Topographic Factor- 1.0. Exposure Category- "D" . Wind Directionality Factor- 0.85 . Velocity Pressure Exposure Coefficient- 1.03 

The seismic forces are also determined in two (2) steps.  First, the basic design force is determined, based on occupancy category, site soil class, building R-value, spectral acceleration from maps/USGS Website, maximum considered earthquake, design base earthquake and period of vibration. Then the Base Shear for design of the support force(s) is determined, based on the duct/pipe specific Seismic Response Coefficient.

Seismic Importance Factor- 1.0. Seismic Site Class- D. Seismic Design Category- ASeismic Response Accelerations: Short Period- Ss-0.153g One Second Period S1-0.056gSeismic Response Modification Coefficient R=3.0. Seismic Response Coefficient Cs-0.054 . Spectral Response Coefficient Cs-0.054. Spectral Response Coefficients: Short Period Sds- 0.163g     One Second Period Sd1- 0.089g

Based on new code requirements, Unistrut Service Company rooftop equipment supports are designed specifically for each project & its location. The scope of these designs is outlined

below:

Quick reference: Maximum Height of Duct from ground level: 60'Ultimate Wind Speed : 120 mph refer to Table #1Ultimate Wind Speed : 190 mph refer to Table #2

Note: Maximum Distance between supports is 5 feet.Maximum height for Dimension C should include insulation if applicable

Rectangular/ Square Duct:

Table #1- 120 MPH ultimate wind speed

Table #2- 190 MPH ultimate wind speed

Part #

Part #

Round Duct:Quick reference: Maximum Height of Duct from ground level: 60'Ultimate Wind Speed: 120 mph refer to Table #1Ultimate Wind Speed: 190 mph refer to Table #2

Note: Maximum Distance between supports is 5 feet.Maximum height for Dimension C should include insulation if applicable

Table #1- 120 MPH ultimate wind speed

Table #2- 190 MPH ultimate wind speed

Part #

Part #

24400 Sperry Drive Cleveland, OH 44145 (440) 348-9460  www.unistrutohio.com

Design Criteria: Supports are designed in accordance with the following codes and specifications: International building code (IBC) 2015American Institute of Steel Construction, April 14, 2010 (AISC 303-16)Specification for Structural Steel Buildings, June 7, 2016Minimum Design Loads for Buildings and Other Structures (ASCE7-10)Minimum Design Loads for Buildings and Other Structures (ASCE7-16)

Better HVAC Duct Supports By Design

Ordering Information:DS  01  PG

Select Width 01=48"02=54"03=60"04=66"05=72"

Select FinishPG= Pre-GalvanizedHG= Hot Dipped Galvanized

Order Example: DS-01-PG is a 48" wide by 45 1/2" tall HVAC duct support with pre-galvanized channel. *Custom design orders are welcome.

Order Online at https://www.unistrutohio.com/rooftop-hvac-duct-supports

PE Stamps Available