How to light baffle grow tent intake vents during dark period of flowering

Does anyone have an easy way to light baffle the bottom intake vents on a grow tent, so that no light gets in during the dark period when flowering, without cutting off passive air flow? I have tried using those black air conditioner filters and a few different types of filters, but they always seems to cut a lot of the passive air draw, causing humidity to spike.

Just make a box with holes for in and out and a baffle inside. Make the inside of the box black so light doesnt reflect.

I was thinking about the same thing today and came up with looking @ different types of ground cover fabric for weeds to see if there's any that allows free air movement.
Maybe when everyone quits coughing on each other I'll hit up a store

Would be very interested in others ideas/fixes for this too.

Someone told me to use a piece of aluminum vent pipe covered with a pair of black nylons. They must have thought I was crazy at the store when I asked what size would fit over a 6 inch diameter pipe. I did get one of the sales ladies to give me a smile lick her lips and check out my bulge

Rayi said:

Someone told me to use a piece of aluminum vent pipe covered with a pair of black nylons. They must have thought I was crazy at the store when I asked what size would fit over a 6 inch diameter pipe. I did get one of the sales ladies to give me a smile lick her lips and check out my bulge

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you must referring to the round 6 inch inlets? I have actually done that before with some aluminum ducting on my old my 2x2 tent. I am talking about the rectangular screened intake vents on either side of the bottom of the tent

My basement stays at 52F constantly year round, and that's where I keep all of my grow tents and cabinets. My main production setup is a bit strange, but it may lead you to ideas of your own.

I have a 4x4x7' flower tent with a 1000W HPS lamp in it. A 2x4x5' veg tent sits beside it. I have a 6" duct running through the 400W MH veg lamp with one end open, with a piece of furnace filter on the top. The other end exits the veg tent through an upper vent port, and enters the flower tent in a bottom vent port. My grow controller turns on a fan in the veg tent which is fixed to the top of the furnace filter blowing downward into the vent pipe, to blow the warm air from veg into flower when the temp gets warm enough. This keeps flower tent higher than basement temp.

To combat the light entering from the veg tent, I cut a close-to 4x4' piece of 5/8" plywood, and elevated it in the flower tent an inch above the top of the passive intakes. There are 3" gaps between the front of the tent and the back of the tent (intakes are on the sides). My plants go on this board. There's about 1' of space between the board and bottom of the tent.

The 3" gaps allow the warm air from the lower dead zone enter the main tent, as well as the cool air from the passive intakes, but any light entering the intakes including the vent from the veg tent is deadened by the board.

My main reason for the elevated shelf was more to keep my plants off of the basement floor. I put a piece of carpet on the concrete, but the board does keep things a bit warmer, especially with the warmer air circulating down there.

However, it does wonders for keeping the light leaks at bay all the same.