The "correct" way to run 4" ducting tube thru ceiling to attic?

Just wondering if someone knows a correct and clean way to run duct tubing thru the ceiling up to the attic? From the ceiling to roof ventilation will be insulated.

I live in a cold climate so, I would like this to be looking somewhat "professional", meaning that I don't want to see insulation spilling from the ceiling.

Anyone know of ways to do this? I can't be the first person to run into this problem.

I would buy some 4" fittings, and run some hard tube through the ceiling and use the 4" flanges on the ceiling and attic side....... Then you hook your flex ducting up to the flanges/ fans.....

dryer vent kit. home depot my friend. has everything you need except the drywall knife. o an be careful cutting the piece out, if you do it properly when you leave you can use the same piece to seal the hole just screw a piece of wood lathe to it so it sticks out 3 inces or so on each side insert the piece into the ceiling and shoot 2 screws in the ceiling lined up so you get the wood and it will suck the piece of drywall right up into the void. just dont tighten too much or it will go too much. then a little spackle an good as new!

My vents are all insulated, flexable vents. They are very easy to use. You can turn corners, and make them whatever length you need very easily. They also help to reduce the sound of air, and insulate the heat while the vent is in the room part.

I just cut a hole a little bigger than the size of the venting, and slowly push it up into the attic as far as I want it. Than, you measure to your fan, or lights, or whatever, cut, and attach with metal bands. Than all you have to do is put some drywall mud around the vent in the ceiling, put some tape over it, and call it good. Looks sweet. Those dryer vent kits are all metal, and the sound of air is hilarious.

I have the same thing as you Bowlfullofbliss I cut my hole about 7-in and used 6-in insulated ducting and just pushed it up through the hole, seals itself tight looks pretty good. In the future I will probably vent it up and out of the roof.

infinitescrog said:

I have the same thing as you Bowlfullofbliss I cut my hole about 7-in and used 6-in insulated ducting and just pushed it up through the hole, seals itself tight looks pretty good. In the future I will probably vent it up and out of the roof.

Click to expand...

Just a word of warning about direct outside venting. A guy in my area got busted last year from that shit. He had his whole room going out one roof vent, and the cops flew over with that FLIR, and you could see the vent from a mile away. It was bright white, and all the other roof vents on his house, and the neighbors were dark. I vent into the attic area, and warm it, instead of straight out. Hopefully it keeps trouble away. I'm legal, but I don't want any issues with the man kicking in my door at 4 am.

i second the dryer vent kit , i just did that with ( suprize ) my dryer last week... i poked a small hole with a screwdriver in the celling , poked a hanger up in the hole , went to the attic to find the hanger , 3 mins to cut the 4" hole with a keyhole saw and droped the vent kit down .. a few squirts of great stuff" ( poly styrine foam brand name ) and a few mins with the dryer vent tube and i was done ...
i used a bit of duct tape just to make it more secure , but the hole in the celling is clean and looks nice ( the vent comes with a 1/4 ring you can install inside the celling to make the hole look pretty ) and the foam makes it air tight.

If you live in a cold climate you DO NOT vent directly into attic. Vent outside or make your attic a mold zone....

In winter your attic is cold blowing all that heat will create condensation. Reason for vapour barrier between insulation and drywall.

Go to home depot and go to the ventilation section.

There is various pieces of sheet metal ductwork. To make a ceiling interface I prefer one type.

It is shaped like a square with a 4" hole through the center. The cube is faced on one side and open on the last side.

Simply position the circle where you want the hole and trace around the flange. NOTE: You might want to poke a hole from the attic side through the drywall to make sure you dont cut a hole in the middle of a joist. Then simply cut the 4" hole in the ceiling.

Go up in the attic and drop the piece through. You now have a 4" flange sticking through your ceiling. Connect a vent pipe to it with a band clamp, tape up the duct, get a 4" sleeve and fit it in the top side of the vent and clamp and tape the hose from there.

Very professional looking, very secure.

Tagh said:

If you live in a cold climate you DO NOT vent directly into attic. Vent outside or make your attic a mold zone....

In winter your attic is cold blowing all that heat will create condensation. Reason for vapour barrier between insulation and drywall.

Click to expand...

So in the summer I should be O.K.? I was planning on venting it completely outside in the winter, I only have 1 600 so it shouldn't be that much heat, even on an FLIR? lol...

Tagh said:

If you live in a cold climate you DO NOT vent directly into attic. Vent outside or make your attic a mold zone....

In winter your attic is cold blowing all that heat will create condensation. Reason for vapour barrier between insulation and drywall.

Click to expand...

In the winter time, I unhook my out going vent from my lights, and use the heat from my lamps to help keep the room warm. Free(ish) heat. Than I take off the vent from my fan and filter, and just run them on a cyclestat timer to keep the room odor in check. I don't vent out anything at all in the winter.

Ha, I can just picture white smoke of heat constantly blowing out the top of my polebarn's coupala (sp?). Nothing going on here neighbors, keep moving along.

tagh has a point. run vent tube to your attic's suffet vents. i would only worry about the cops using flare to find you grow operation because off heat lose out a vent in the winter everones house loses heat out vents. your stove and drier are vented. they are looking for hot spots from the lighting not from vents. they look for heat excaping from vents that are comming from sheds and holes in the ground. if your still worried split the vent up into more than one hose to defuse it. or by a long lenth of uninsulated vent hose and have it run around in circles in you attic so that the air in the tube has time to cool down before it leaves house. in theory your making a form of radiator

an now you know why you cant buy S.A.M.'s service to air missles... take down that helilicopter ! NAH IM JOKING ! LOL im just HIGH !

whietiger you dont need a sam to take down a police chopper. they have no armor at all. a good hunting rifle with a scope will do it easily. one shot to fuel tank and pow!

Anyway thanks for all the advice. I decided to run 4 inch flex up to the ceiling....from there I used a dryer kit to run thru the ceiling. On the attic side I have solid 4 in tubing that is insulated. That runs through and joins up with the bathroom fan vent tube that then exhausts out the roof.

The only thing that I would change right now is to add a 1-way flap before it meets the bathroom exhaust. If I have the bathroom fan on, and no powered exhaust on the garden side...I can feel air current rushing back into the grow room.

If you can run your flex ducting into your chimney that what I did. It vents your smell out high above your house so that it doesnt blow into your next door neighbors open window. Also to add to what bowlfullofbliss said above about the cops flying over I have a friend thats in the military and is trained to run FLIR equipment, he advised me that if I ran it into my chimney instead of into my lower roof because the heat going into the chimney would look normal through a helicopters FLIR instead of having one roof that 20degrees warmer than the others. Also as infinitescrog stated above if your venting warm air into a cold space the condensation will have mold all through your ceiling and attic.
But if you want to run it through your ceiling and have it look professional Id get a flange that matches you vent size then connect it to a piece of pvc pipe that the correct size and run that up as far as it needs to go.