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InvisibleSci-Fi
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Re: Need help building a flowhood. [Re: BEEP]
    #12410147 - 04/17/10 04:49 PM (14 years, 8 months ago)

Quote:

BEEP said:

OK, I got them in the mail, I ordered a 18" x 24" filter and the universal blower, now I'm trying to wire it and I just want to make sure I got it right, I've also been reading this thread with the same blower.

I figured on my own that the black and blue go together and connect to the black on my 2 prong cord, the white is by it self connected to the white on my cord and the orange and red go together and are put aside, is this correct?

Also the manual and everything stresses it needs to be grounded somehow, there is a half green half yellow wire coming from the motor housing going to the blower output area screwed into it and theirs a ground symbol sticker next to it, so is it safe to assume that it's already been grounded for me or is there something else I need to do?

I really don't want to blow this thing up the first day I get it :lol:

E: I'm reading more threads and I'm starting to get confused, do I need a special plug or something?

Hmm, Will I need to put duct tape or something over half the intake, FP for some reason say they match but in the thread above RR says it's way to big even for a 4' x 4'?




OK first of all I completely agree with RR. This fan is WAY TOO BIG! The smaller fan FP sells is still a little stronger than I recommend for that size filter, but it will work. If you connect your filter to that fan you're likely going to damage it. You should shoot for a feet per minute speed of between 80- 100. The fan you bought will push a minimum 350 Feet per minute through your filter! Three times more than you want! I'm afraid their website is completely inaccurate in this regard. I have never seen a hepa filter rated for even close to that speed even if money was no object. You need to return that fan and buy this one. It's almost perfect for your filter. it's still just a little bit to big.

The all those leads on your current fan are for different voltage sources. Connecting the two different colors together doesn't sound right to me at all. It's possible it will short out and blow up. It's very possible it will permanently damage the fan. I can't tell you exactly how to wire it up without some information from the manual. Type out word for word anything in regard to the wiring and I can tell you how to connect it. OR Take a picture of the manual especially if there are any wiring diagrams (basically a bunch of lines) The green/yellow wire is the ground and should only be connected to the ground.
And no you don't need a special plug.

Edited by Sci-Fi (04/17/10 05:09 PM)

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OfflineRogerRabbitM
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Re: Need help building a flowhood. [Re: BEEP]
    #12410248 - 04/17/10 05:12 PM (14 years, 8 months ago)

Post a picture of the data plate showing the electrical connections and I'll tell you how to wire it.  You might have to send a PM and link me back to the thread.  I'm only here for a few minutes at a time, and a few days in between sometimes.

The green ground wire connects to the chassis of the motor and also to the green wire on your cord.  For the rest, I'll need the diagram.
RR


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InvisibleSci-Fi
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12410383 - 04/17/10 05:47 PM (14 years, 8 months ago)

LOL, just quote my post next time, it's faster :awetongue:


Edited by Sci-Fi (04/17/10 06:06 PM)

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InvisibleBEEP
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Re: Need help building a flowhood. [Re: Sci-Fi]
    #12431595 - 04/21/10 11:54 AM (14 years, 8 months ago)

Quote:

RogerRabbit said:
Post a picture of the data plate showing the electrical connections and I'll tell you how to wire it.  You might have to send a PM and link me back to the thread.  I'm only here for a few minutes at a time, and a few days in between sometimes.

The green ground wire connects to the chassis of the motor and also to the green wire on your cord.  For the rest, I'll need the diagram.
RR




So you're saying I need a 3 prong cord and I connect this wire to the green wire on my cord
I'm a little confused. Do I need another wire and connect it to the once pictured then connect that to the green on my cord?


here is everything I could get off the blower.




Also, when I build the plenum around the filter does the filter have to be facing a certain way, theres a foam strip around it on one side that I want to hide in the box but the top says "test air flow this way" like the air needs to be pushing out that side, i'm not sure.

Oh and I called fungiperfecti and spoke to someone about the blower, they still swear that it's the perfect blower for that filter, they said they have been building them and using them that way for 10+ years. :shrug:

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OfflineRogerRabbitM
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Re: Need help building a flowhood. [Re: BEEP]
    #12431908 - 04/21/10 12:53 PM (14 years, 8 months ago)

The foam is usually to seal around the seat you make to push the filter into.  Make the air flow the direction of the arrow on the side of the filter.

Get a three pronged cord.  It's usually cheaper to buy a three prong heavy duty extension cord, which you then cut the female end off and strip the wires back.  That's usually more economical than buying the parts separately.

Connect the green on your power cord to the green on your motor.  This should also bond to a screw on the metal parts of the blower/motor.

Connect the white on your cord to the white on the motor.

Since you're using 115 volts, twist the blue and black motor leads together, and then connect them to the black wire on your power cord.

Connect the orange and red wires together, and then insulate them away from the others.

Doing this, the motor will run any time you have it plugged in.  The cord and wall socket become your 'switch', which is perfectly legal and safe.  Should you decide to add a switch later, be sure to get a 'motor rated' switch, not a light switch.  Connect it in series with the black wire on your cord.
RR


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InvisibleBEEP
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12432759 - 04/21/10 03:22 PM (14 years, 8 months ago)

Quote:

RogerRabbit said:
The foam is usually to seal around the seat you make to push the filter into.  Make the air flow the direction of the arrow on the side of the filter.





T%he foam is supposed to go on the inside of the plenum into the seat that's there to hold the filter in place? well the arrow is pointing toward the foam side and there aren't any other arrows on the filter :confused:




Back to the blower, I'm still a little unsure on what to do about the green/yellow one, I disconnected it from where it was originally like pictured a few posts up and connected one end to the other grounding thing then connected the other to the green on the cord.

here's what it all looks like

It's hard to tell whats what but everything is how it's supposed to be, I just want to make sure I got the grounding right.

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OfflineRogerRabbitM
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Re: Need help building a flowhood. [Re: BEEP]
    #12432933 - 04/21/10 04:00 PM (14 years, 8 months ago)

Yes, it's grounding the chassis of the motor/blower and that's what you want.  The idea is if the motor shorts out or a wire comes loose and touches the metal, it will trip the breaker.  If the metal wasn't grounded, the breaker wouldn't trip and you could get electrocuted from touching it.  It looks ready to plug in.  Once you see that it runs, route your cord through the knockout into that junction box, and then put the cover on.  Get a romex connector to act as a strain relief and to protect the cord.

The foam is to help seal around the seat.  Your box is going to need a lip at the exit end of the filter to get a good seal.  You don't want air bypassing the filter and coming out around the edges.
RR


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Thomas Edison

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InvisibleSci-Fi
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12435516 - 04/22/10 12:04 AM (14 years, 8 months ago)

Quote:

BEEP said:
Oh and I called fungiperfecti and spoke to someone about the blower, they still swear that it's the perfect blower for that filter, they said they have been building them and using them that way for 10  years. :shrug:




What does the test sheet say for the rated CFM of that filter? It should have been packaged with the filter or on a label on the side of the frame. They give you the maximum CFM the filter will still be hepa rated. I'd be really interested to see a 24 x 18 hepa rated  @ 1200 cfm. Either way It's going to be windy in front of that hood.

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InvisibleBEEP
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Re: Need help building a flowhood. [Re: Sci-Fi]
    #12437377 - 04/22/10 11:53 AM (14 years, 8 months ago)

Like, 450 or something, I'm just going to put it together and see, maybe seal a couple furnace filters in front.

What do you think I should do?

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Re: Need help building a flowhood. [Re: BEEP]
    #12437411 - 04/22/10 11:57 AM (14 years, 8 months ago)

I think you should build it and if it blows to hard, block off part of the intake to restrict flow.  A more expensive fix is a motor speed controller. 

Always use a pre-filter.  Otherwise, your expensive hepa will need to be changed twice a year when it clogs up.  Using a good pre-filter, the HEPA will last for thousands of hours.
RR


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semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
Thomas Edison

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InvisibleBEEP
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12437491 - 04/22/10 12:08 PM (14 years, 8 months ago)

My idea was to put two in front of the intake and insted of them just sitting there, make an airtight seal with silicone or something, if that doesn't work I'll block more off.

I don't think I got the chance to thank you for coming back to this thread so many times, so thanks :smile:

And thanks to everyone else that helped out too :thumbup:

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InvisibleSci-Fi
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Re: Need help building a flowhood. [Re: BEEP]
    #12439334 - 04/22/10 05:28 PM (14 years, 8 months ago)

I would recommend a 3M Filtrete Ultimate Allergen Reduction filter. They can actually be ordered in a in 18 x 24 size. They will reduce most of the contaminates before they ever make it to the HEPA making your Flow hood much more efficient and your HEPA will last much longer. It would normally cause a slight loss in airflow, but in your case it's only going to help you. A similar filter would be anything rated MERV 10, 11, or 12.

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InvisibleBEEP
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Re: Need help building a flowhood. [Re: Sci-Fi]
    #12445727 - 04/23/10 06:34 PM (14 years, 8 months ago)

Thanks sci-fi, I got some filters over it already though, but I am going to look for a speed controller at home depot. It is blowing pretty hard.

It's also not blowing through consistently, the area where the blower is positioned is pushing more air through (go figure..) is it going to be a problem?

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Re: Need help building a flowhood. *DELETED* [Re: BEEP]
    #12446767 - 04/23/10 10:16 PM (14 years, 8 months ago)

Post deleted by Sci-Fi

Reason for deletion: fuck


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OfflineRogerRabbitM
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Re: Need help building a flowhood. [Re: Sci-Fi]
    #12446831 - 04/23/10 10:35 PM (14 years, 8 months ago)

Quote:

It's also not blowing through consistently, the area where the blower is positioned is pushing more air through (go figure..) is it going to be a problem?




The blower should pressurize the plenum as shown in the pic of the fp hood above.  It shouldn't be blowing right on the filter.  Block off part of the pre-filter to reduce flow.  It will accomplish the same thing as reducing speed, and reduce load and power consumption on the motor too.
RR


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semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
Thomas Edison

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InvisibleBEEP
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12446939 - 04/23/10 11:00 PM (14 years, 8 months ago)

The blower is definatly not blowing towards the filter, it's blowing straight down like in that picture, it's not centered though, but my guess is, even if it was it wouldn't be consistent at the center and the sides either.

Tomorrow I'm going to take the blower off and add some wood on the inside of the plenum so it hits that first.

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InvisibleSci-Fi
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12446958 - 04/23/10 11:05 PM (14 years, 8 months ago)

The blower should pressurize the plenum as shown in the pic of the fp hood above.  It shouldn't be blowing right on the filter.  Block off part of the pre-filter to reduce flow.  It will accomplish the same thing as reducing speed, and reduce load and power consumption on the motor too.
RR




You don't think blocking the intake would cause the motor to have to work harder and draw more electricity??

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Re: Need help building a flowhood. [Re: Sci-Fi]
    #12447140 - 04/23/10 11:35 PM (14 years, 8 months ago)

Quote:

You don't think blocking the intake would cause the motor to have to work harder and draw more electricity??




No.  Air doesn't work like hydraulic fluid. In commercial HVAC systems, a varicone is commonly used to regulate airflow, thus keeping the building at the correct static pressure.  If static pressure is too high, the doors don't close, if too low, dirt enters the building.  However, the blower motor runs at the same speed all the time and the intake is blocked to control pressure.  You can test this yourself.  Block part of the intake on a blower while  a clamp-on ammeter is around one of the motor leads.  You'll see a decrease in current.

To BEEP, it sounds like you didn't build your plenum large enough.  If the same pressure is exerted across the back of the filter, the flow will be even out the front.
RR


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"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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Re: Need help building a flowhood. [Re: RogerRabbit]
    #12455527 - 04/25/10 06:47 PM (14 years, 8 months ago)

Beep, I don't know much about flowhoods, but do you think this type of  ceiling fan dimmer would work for regulating your blower speed?

Would it work? it's cheap though.. but you should ask a pro.

:cheers:


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Re: Need help building a flowhood. *DELETED* [Re: ElSeta]
    #12457615 - 04/26/10 01:04 AM (14 years, 8 months ago)

Post deleted by Sci-Fi

Reason for deletion: fuck


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