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Scrimshaw
Sponsored by Sterilite



Registered: 06/27/14
Posts: 643
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Flowhood - Polyurethane and Speed Question
#27121566 - 01/02/21 05:55 AM (3 years, 26 days ago) |
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I finally started construction of my flowhood.
The wood is 3/4” Red Oak plywood sanded with 3 coats of polyurethane. So far I have only put the poly on the exterior surfaces. Is it worth putting poly on the interior surfaces as well? Any pros or cons?
Also, my blower is a TDU2 paired with a 24x24x6 0.8wg hepa. The blower is most likely overpowered initially but I wanted to leave room to increase speed as the filter gets older. I have done a lot of searching the forums and it seems speed controllers have pretty mixed results. This blower specifically says not to use one, but I have seen others using the same model with seemingly no problem. Any controller that’s better than others? I’ll just choke the intake of a controller is a no-no.
Thanks!
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Scrimshaw
Sponsored by Sterilite



Registered: 06/27/14
Posts: 643
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Re: Flowhood - Polyurethane and Speed Question [Re: Scrimshaw]
#27123955 - 01/03/21 01:28 PM (3 years, 25 days ago) |
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Bumping in hopes to get these questions resolved before assembling. Thanks!
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natedawgnow
Rocky mountain hood rat



Registered: 02/09/15
Posts: 8,939
Loc: ation
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Re: Flowhood - Polyurethane and Speed Question [Re: Scrimshaw]
#27123974 - 01/03/21 01:39 PM (3 years, 25 days ago) |
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If it specifically states not to use one I wouldnt for fear of voiding a warranty or something.
Pretty sure the tdu2 has different speeds doesnt it? Like a low med high?
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Scrimshaw
Sponsored by Sterilite



Registered: 06/27/14
Posts: 643
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Re: Flowhood - Polyurethane and Speed Question [Re: natedawgnow]
#27124027 - 01/03/21 01:58 PM (3 years, 25 days ago) |
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I don’t believe so. There is a single wiring diagram that came with the blower so I’m going to use that method. I think other blowers you can choose speed based on the wire color and capping the ones you don’t use, but in the diagram, all wires are accounted for and nothing about speed is in the manual.
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RoscoeReturns
Crotchety chode man



Registered: 02/12/18
Posts: 1,738
Loc: State of Confusion
Last seen: 5 hours, 19 minutes
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Re: Flowhood - Polyurethane and Speed Question [Re: Scrimshaw]
#27124331 - 01/03/21 04:55 PM (3 years, 25 days ago) |
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How are you assembling? If using PVA wood glue, do not seal the joining surfaces or the joint will be weak. Poly on the inside will protect the wood from moisture, which there should not be any of in your hood anyway. Poly might make a cleaner surface, ie no particles shedding, but upstream of the filter it should make very little difference. It’s really your choice, not much benefit, not really hurting anything unless it effects assembly.
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Scrimshaw
Sponsored by Sterilite



Registered: 06/27/14
Posts: 643
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Re: Flowhood - Polyurethane and Speed Question [Re: RoscoeReturns]
#27124679 - 01/03/21 08:19 PM (3 years, 25 days ago) |
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Great point about the assembling. I will be using glue and deck screws. The plan should avoid fastening any poly’d surface but I will be applying silicone at all the connections. I think leaving the slightly rougher wood will help adhesion. Thank you.
Any thoughts on the speed controller? I came across some solid state controllers that say they are ok for squirrel cage blowers. Using the dial is easier and better looking than blocking the intake, but I don’t want to burn up a $250+ blower.
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RoscoeReturns
Crotchety chode man



Registered: 02/12/18
Posts: 1,738
Loc: State of Confusion
Last seen: 5 hours, 19 minutes
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Re: Flowhood - Polyurethane and Speed Question [Re: Scrimshaw]
#27124773 - 01/03/21 09:04 PM (3 years, 25 days ago) |
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If it says it’s not to be used with a speed control, just don’t. There are a number of variables that determine wether or not a blower motor can be throttled back, and unless you know your shit you can’t take the speed controller specs to know if it will burn up your motor. Is the speed control a triac, a PWM, a rheostat? Does it vary voltage, AC frequency, duty cycle? Can your blower run at low speed and still cool itself? If you want speed control, buy a blower designed to use one, and buy the control meant for the blower. Anything else is a crapshoot.
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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Re: Flowhood - Polyurethane and Speed Question [Re: RoscoeReturns]
#27124816 - 01/03/21 09:17 PM (3 years, 25 days ago) |
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I'm using the same blower without the speed controller. You don't need one.
Just restrict the intake.. The more you restrict the intake the less amperage your blower will use.
It sound like your going to have a fine piece of furniture/flowhood.
Your blower can be wired for 120v 240v..
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Scrimshaw
Sponsored by Sterilite



Registered: 06/27/14
Posts: 643
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Re: Flowhood - Polyurethane and Speed Question [Re: micelio]
#27125600 - 01/04/21 08:53 AM (3 years, 24 days ago) |
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Ok nice. So the consensus is no speed controller. How do you block the intake on yours? My plan is cardboard and or gorilla tape over the intake and a prefilter.
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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Re: Flowhood - Polyurethane and Speed Question [Re: Scrimshaw]
#27126276 - 01/04/21 02:14 PM (3 years, 24 days ago) |
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I use a wax coated cardboard with duck tape
on my main flow hood that I do most the work on I use plexiglass that slides in and out on the outside of my blower box. That way when I have my pc cooling down in front of the filter I give it all she got.
It's nice to open and unload your pc in the flow..
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