Source for 10 inch ducts

[beadgirl]

Can anyone tell me where to get 10 and 12 inch solid duct work from?? :oops:
If i reduce the diameter of the duct run the static pressure increases and I loose Cfms[-o<

Lowes carries 6 and 8 inch, grainger has 8 inch as well.
MarieAnn

[Dale M.]

Try local HVAC supplier.... Most local shops stock a supply of various sizes duct work and the are usually reasonable in pricing...

How much CFM are you trying to push that 8 inch duct is to small...

Dale

[beadgirl]

Thanks Dale,
I am so confused the grainger tech told me to stay with 10" duct for this fan, Why ??
The outlet on fan is 10 1/4 ". It was my understanding that I need to keep with the same size so I do not increase the static pressure and loose efficiency.
It certainly would be easier to get the 8" duct from lowes if they carry it.
Application: open faced box 36 wide by 30" tall =1080
1080 divided by 144 = 7.50
7.50 x 100= 750
Solid duct 5 ft long straight up
one 90 degree bend to exit building
www.grainger.com
product code 1TDT4
PCS Blower,115 Volts
PSC Blower, Forward Curve, Direct Drive, Wheel Dia 8 1/4 In, CFM @ 0.000-In SP 805, Voltage 115, 60 Hz, Single Phase, Full Load Amps 2.75, RPM 1090, Max Inlet Temp 104 Deg F, Overall Height 14 7/8 In, Overall Width 10 1/2 In, Overall Depth 13 1/8 In Grainger Item # 1TDT4
Brand DAYTON
Tech
Specs Additional
Information Notes &
Restrictions MSDS
Required
Accessories Optional
Accessories Alternate
Products Repair
Parts Item PSC Blower
Type Forward Curve, Direct Drive
Wheel Dia. (In.) 8 1/4
Wheel Width (In.) 4 1/16
CFM @ 0.000-In. SP 805
CFM @ 0.100-In. SP 770
CFM @ 0.200-In. SP 730
CFM @ 0.300-In. SP 685
CFM @ 0.400-In. SP 645
CFM @ 0.500-In. SP 605
CFM @ 0.600-In. SP 562
CFM @ 0.700-In. SP 485
Voltage 115
Hz 60
Phase Single
Full Load Amps 2.75
RPM 1090
Bearing Type Ball
Motor Type Permanent Split Capacitor
Motor Enclosure Open
Motor Insulation Class B
Thermal Protection Auto
Lead Length (In.) 13
Conduit Box Yes
Ambient Temp. (Deg. F) 104
Max. Inlet Temp. (Deg. F) 104
Inlet Dia. (In.) 7
Outlet Height (In.) 5 9/16
Outlet Width (In.) 6 1/8
Overall Height (In.) 14 7/8
Overall Width (In.) 10 1/2
Overall Depth (In.) 13 1/8
Mounting All Position
Housing Finish Gray Enamel
Housing Material Rolled Steel



12'' Duct for Free Flow Make up air comming up from under table Cut hole in Table at least 10 feet from exhaust.
Okay I admitt it wish I was still playing in the insulation now all hot and ichy.
MarieAnn

[Dale M.]

IF my spread sheet is correct, if you use 8 inch duct and run is 5 feet of straight duct, and one 90° turn your static pressure should be between 0.139 and 0.165 and with fan you have shown specifications for, it will give you between 770 and 733cfm which should be suffient...

Dale

[bhhco]

Thanks Dale,
... The outlet on fan is 10 1/4 ". It was my understanding that I need to keep with the same size so I do not increase the static pressure and loose efficiency....
www.grainger.com
product code 1TDT4
....insulation now all hot and ichy.
MarieAnn


The 'outlet' on this fan is 6.25" x 5.75" rectangular.
The input is 7" diameter, matching well to 8" duct work.
This is a forward curve fan... biased to push, not pull... nominally located in a plenum, at the beginning of the duct work.

Me

[Dale M.]

Good catch Bill..... You help keep me honest....

Dale