Question about Jenn-Air Ventilation System for Custom Hood Installation, JXT7036A
Need to moove 1500 CFM of Air over a distance of 75ft with four 90's before fan. There is another 20ft with two 90's after the fan. What size duct Is needed? Ducting is spiral, galvanized steel.
Currently ducting is 12" with a 3/4hp tube fan. I feel duct and fan are just too small to move this amount of needed exhaust that distance.
Are there online calculators for this? Thanks, Ryan
There are online formula to calculate what you want
google ---formula to calculate air flow in pipes--
calculation will have to allow for the turbulence and restriction caused by the spiral construction of the tubing and the bends involved so you may have to incorporate several formulas to get the desired result
distance is critical as there are frictional coefficients to be considered as well
I would consider from large shop air circulation systems (as you see in Aldi, woolworths , sears etc ) that a staged diameter difference from motor to exhaust point be considered as that will keep a steady air flow for the length of the tube and a hp rating of 3hp 3 phase as a minimum
Talk with the engineers of shop and factory air conditioner designers and installers to get a close idea to what would be suitable for you
Posted on Aug 03, 2017
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
I'm Harvey the Master Plumber.
Your problem is: You are looking for a high quality roof mounted termination vent cap for 8" O.D. round ducting for your Jenn-Air downdraft Stove Top/Convection oven. The reason for the 8" ducting is that you are using insulated stove piping out of the wall of the house into a cold porch then up through the roof. You have come across a Broan Vent Cap that will accommodate 3-1/2" by 10" rectangular ducting and/or 8" O.D. round ducting. The problem with this Broan unit is it has an aluminum flapper that has no counter resistance mechanism to keep from readily flapping open and shut during weather related wind events. Is there something better out there? You found us through a Jenn-Air link. Help!
An 8" B-vent cap should work fine. Can be purchased at any plumbing supply. Just make sure you attach it with screws.
Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Harvey your Master Plumber
Posted on Oct 14, 2008
Tips for a great answer:
Apr 01, 2015 | Cfm Heating & Cooling
Jan 06, 2015 | Brisk Air Heating & Cooling
Aug 02, 2012 | iSymphony 40" Class 1080p 60hz LCD Smart...
Aug 09, 2011 | Heating & Cooling
Sep 21, 2010 | Coleman Heating & Cooling
Oct 04, 2009 | Cooktops
Jun 20, 2009 | Carrier Heating & Cooling
620 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: