im planning a super size scrog with p.o.g ith 3 nft,s 4 mts long 1,1/2 wide ,but my room is 3 mts wide will this afect it in any way

If I'm reading you correctly, you have 3 trays? Sorry but not a hydro head here. Anyway, what I did was make one screen for each of my trays (3 trays, each 1 meter by two meters). Each screen, for me, is as large as my tray. It depends on your light coverage as well.

What you want to keep in mind is that you need to be able to reach under/over the screen in order to train your plants.

Details of what I did are in my 3rd diary.

i hav nft 424 and 2 604 my room is 4m long and 3ms wide i plan the 604,s side by side length ways n the 424 at 1 end like an l shape screen with 3 600 watt bulb do think it will work does scrog have to be done in consealed box

yeah should work fine dude

nice 1

Before building it, walk around the intended space and go through the motions of weaving the screen to see just how much access you'll need. In an XXL tent, I can only scrog one half at a time and there's still a corner I can't get to.