Important ventilation/ducting question, help!

Alright, I have a 1000w in an enclosed hood, a 8" Can Fan rated at 737 CFM, the problem I'm having is the Hydrofarm "reinforced" ducting keeps blowing out, its not strong enough, I've went through 3 rolls of it. It seems to be blowing out at the bends, so I took it apon myself to apply a new line of ducting and try to reinforce it with duct tape, did not help at all.

So now for the mean time I've ordered some aluminum flexable ducting online, since no local retailers carry it, not even the suppliers, and they sent me the wrong size.

What ducting do you guys use for your 8" Fans? Any advice or help is much appreciated.

20+ views an no advice?

what do you mean by blowing out? does it get a random hole in it on a turn or sharp bend or is it blowing apart at the connections where you attach it to the blower or hood?got ant pics of the blow out

I have the exact same fan setup, but I have my fan hooked up about 10 inches above a can 75 carbon filter and its pulling through the filter and then using the exhaust to cool the lights...

Do you have a carbon air scrubber hooked up?

Im running 8" hydro farm ductiong and have no issues with it.

I got 8" alluminum collapsable ducting from home depot, cheap! fu%^ that overpriced ducting! I use a self tapping screw to screw it to fan then tape it with the shiny silver ducting tape. I use same can-fan to suck air out of 3 rooms and then it blows it through an ozone generator then out 30ft of 8" ducting and out my front door.

sixstring2112 said:

what do you mean by blowing out? does it get a random hole in it on a turn or sharp bend or is it blowing apart at the connections where you attach it to the blower or hood?got ant pics of the blow out

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Basically, the ducting is formed in a spiral fashion, it will get a hole about 6 to 10 inches width wise around the ducting, ignoring the adhesive that keeps it together.
And its blowing apart on the bends and corners and on the connection to the fan. Sorry, I dont have any pics untill I can find the damn usb connecter for my Camera.

cocaregiver said:

Do you have a carbon air scrubber hooked up?

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No carbon scrubber, the sole purpose of this fan is to cool the light and regulate temperatures that the 1000w generates in the small area I have it.

UrbanAerO said:

I got 8" alluminum collapsable ducting from home depot, cheap! fu%^ that overpriced ducting! I use a self tapping screw to screw it to fan then tape it with the shiny silver ducting tape. I use same can-fan to suck air out of 3 rooms and then it blows it through an ozone generator then out 30ft of 8" ducting and out my front door.

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Hmm, what do you mean aluminum collapsible ducting, do you mean the hard flexible aluminum ducting? If thats what your referring to, no local Home Depot or Lowes in my area carried that shit, neither did their suppliers, or the other suppliers for ventilation or heating equipment.

Also, I'm pushing air through the hood, I wonder if pulling air through the hood like you mentioned would make a difference.

I pull air out of the top corner of the room, thats where the heat is. as far as the ducting I got it from home depot, it comes compressed and you pull it out to like 16'. maybe hang the filter up high duct it to the light and then suck it out with the fan, blowing it out of the room.

thats a lot of pressure to pop spiral flex tubing. I would suggest increasing your flex tube duct diameter, thereby decreasing the amount of pressure being applied through those turns. The duct's expensive but worth it.

I do heating and cooling and i have never seen this, i think your turns are too tight if that is where the blowouts keep happening.you might have a bad batch of flex pipe that got really old. or your turns are so sharp it is decreasing the flow of air too much.you can buy hard pipe and elbows from the deep hole or lowlifes and do it all up that way.

Thats way to much cfm for one 1000 watt light, I bought my fan and filter system in a kit and its pulling through a large filter then pushing through three 1000 watt lights and its still blowing tons of are out the exhaust.

cocaregiver said:

Thats way to much cfm for one 1000 watt light, I bought my fan and filter system in a kit and its pulling through a large filter then pushing through three 1000 watt lights and its still blowing tons of are out the exhaust.

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I have a very small area is the reasoning..

Sweet Mattness said:

thats a lot of pressure to pop spiral flex tubing. I would suggest increasing your flex tube duct diameter, thereby decreasing the amount of pressure being applied through those turns. The duct's expensive but worth it.

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Well the thing is, I have my plants in a grow tent an the intake and exhaust holes are only 8"

sixstring2112 said:

I do heating and cooling and i have never seen this, i think your turns are too tight if that is where the blowouts keep happening.you might have a bad batch of flex pipe that got really old. or your turns are so sharp it is decreasing the flow of air too much.you can buy hard pipe and elbows from the deep hole or lowlifes and do it all up that way.

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If I cant find any 8" flex duct in my area that will withhold this type of pressure, I might have to.. thanks

Lowes and Casa Depot carry flexible insulated ducting. Look here
It also insulates the heat in the line from getting in your room.