Featuring a similar design to the time tested model 1 5 the model 3 0 is just as simple to install and is guaranteed to withstand harsh rooftop conditions for years to come.
Smacna duct support on roof.
For all other ducts of any application.
A copper roof was used on the rebuilt old senate chamber in 1819.
Page 2 106 the load is 146 lbs load for 70 inches x.
Sheet metal and air conditioning contractors national association 4201 lafayette center drive chantilly virginia 20151 1219 tel 703 803 2980 fax 703 803 3732.
Tip you can figure the load on a duct of half of the width using table 2 46 and then double the load.
Brackets curved unistrut channel.
2 500 pa w g.
Information required for duct construction 1.
Duct construction ductwork and supports shall conform to the hvac duct construction standards metal and flexible third edition 2005.
Roof hvac duct supports unistrut roof support system bases roof crossover stairs crossover ramps s 5.
Or less as measured from the top of the duct to the bottom of the support where.
If the designer does not designate pressure class for duct construction on the contract drawings the basis of compliance with the smacna hvac duct construction standards is as follows.
Duct dimensions duct dimensions shown in the contract.
Duct over 120 inches determine the tie rod load.
Miro industries is excited to announce the official arrival of the latest addition to the miro product lineup the model 3 0.
Snow retention systems zsi safety products s 5.
The php d duct support leverages a goal post design with a single crossbar below the duct to support all sizes of square or round ducting cable trays and piping.
For all ducts between the supply fan and variable volume control boxes and 1 250 pa w g.
This support can meet nearly all height requirements above the roof surface and is approved for seismic and high wind applications.
Solar attachment clamps for metal roofs unistrut tools hardware s 5.
The types of fittings to be used based on the designer s calculations of fitting losses i e square versus 45 entry taps conical versus straight taps etc.
Duct over 120 inches.
Substrate failed early metal roofs were batten style or flat seamed until.
A comprehensive duct layout indicating sizes design airflows pressure class and routing of the duct system.
Where fittings of configurations not shown in the hvac dcs are shown on the contract drawings they shall be constructed as though they were therein.
140 2 70 inches rs 28 inches duct over 120 inches.
