Would love advice/constructive criticism of room/tent odor control

[Keif Richards]

All - long message, but summary: I need to control odor as a priority. Please see details below.

First, it's legal to grow where I am, so smell isn't going to cause an issue, per se. But I have private reasons that smell must be virtually eliminated to the extent humanly possibly. Cost is no factor to do this. I will also be getting an Ona bucket and Ona fan. Here is my plan (see attached pictures).

I'm in an underground basement room/office. I bought a tent, 4.5x4.5x6.5. I have a 6" fan w/18" carbon filter for the inside. I also have a massive 3' air cooled light hood.

Here is my plan. Have the fan and filter inside the tent with the ballast outside (on top). Use one of the small access ports on the bottom with a 4" fan and filter to move fresh, filtered air into the tent. Exhaust the hot inside through the filter, through the hood, through the fan, and outside a window directly above the tent. From filter to window it's maybe 7-8' of hose. Fans have speed controllers to dial in the air pressure.

I also bought an air register fan for the ceiling, mainly to keep smells from creeping back through the register.

What are the chances this setup is going to eliminate virtually all odors inside the room/house, and significantly outside the house?

 

[MICHI-CAN]

All - long message, but summary: I need to control odor as a priority. Please see details below.

First, it's legal to grow where I am, so smell isn't going to cause an issue, per se. But I have private reasons that smell must be virtually eliminated to the extent humanly possibly. Cost is no factor to do this. I will also be getting an Ona bucket and Ona fan. Here is my plan (see attached pictures).

I'm in an underground basement room/office. I bought a tent, 4.5x4.5x6.5. I have a 6" fan w/18" carbon filter for the inside. I also have a massive 3' air cooled light hood.

Here is my plan. Have the fan and filter inside the tent with the ballast outside (on top). Use one of the small access ports on the bottom with a 4" fan and filter to move fresh, filtered air into the tent. Exhaust the hot inside through the filter, through the hood, through the fan, and outside a window directly above the tent. From filter to window it's maybe 7-8' of hose. Fans have speed controllers to dial in the air pressure.

I also bought an air register fan for the ceiling, mainly to keep smells from creeping back through the register.

What are the chances this setup is going to eliminate virtually all odors inside the room/house, and significantly outside the house?View attachment 4924652View attachment 4924653

Looks to be adequate as diagrammed. I use a single 6" wind tunnel in my 4x4 vented back into the room. Never an issue and minor smell. Curing closet is worse. The exterior venting should compensate for the increased heat of an HID light with cooled hood.

 

[SheeshM]

When you open the tent during flowering, the smell will come out into the room but the filter on your intake should act as a scrubber and eliminate most of the odor. The other option is to use passive intake (remove the intake fan and filter and leave that intake vent open; let the exhaust pull the air in). Then, use your 4" fan and filter as a stand alone scrubber in the room. The one area for improvement I see is your exhaust design. You have 3, 90 degree bends and each bend lowers airflow. Can you extend the exhaust when it leaves the tent and just use one gradual bend to get to the window?

 

[Keif Richards]

When you open the tent during flowering, the smell will come out into the room but the filter on your intake should act as a scrubber and eliminate most of the odor. The other option is to use passive intake (remove the intake fan and filter and leave that intake vent open; let the exhaust pull the air in). Then, use your 4" fan and filter as a stand alone scrubber in the room. The one area for improvement I see is your exhaust design. You have 3, 90 degree bends and each bend lowers airflow. Can you extend the exhaust when it leaves the tent and just use one gradual bend to get to the window?

Thanks for the replies!

I built it and ran into some issues. I had to change the design. I bought a "complete kit" from HTG Supply. No idea why they thought it was a good idea to supply this giant fucking hood with a 4.5x4.5 kit. It barely fits. But oh well, this is what I have.

So, yeah, now I have 4 90 degree bends, not 3.

However, the exhaust, with all those bends, still sucks the tent in so much it looks like it going to collapse. It's insane. I got rid of the intake fan and had to open the passive vent to stop this thing from imploding. It definitely didn't reduce the CFM's as much as I thought. Certainly not enough to matter. But I don't think this 4" fan and 12" filter is going to do much in a room this big (160-ish Sq/ft).

NEW QUESTION - Is 84 degrees at the floor way too hot? When it's on 1000w it's 84 at the floor after 2 hours. 750w keeps it at 78-79. I assume 600w will make it even cooler. I'm only doing 3 plants (autos), so is 1000w way to much anyway for 3?

 

[xox]

i wouldnt keep the ballast sitting on top of the tent they get pretty hot. usually theres 4 holes in most digital ballasts should screw plywood to the wall nearby and mount the ballast to the plywood. 1000 watts for 3 autos is likely overkill in a tent your going to have alot of heat problems. yes 84f is way too hot your plants especially small seedlings would prefer it to be cooler. 70f would be better. when there bigger 75f

 

[Keif Richards]

Yeah, I meant to say outside, not on top, of the tent. The ballast is on the ground on a wooden platform next to the tent.

I let the tent cool off, turned the ballast to 600w, and I put the thermometer on a box where the canopy would be (about 12-15" from the light). Two hours later it's only 78. I'll play around with things, but I might just have to run it at 600w I guess?