ok here is updated photos, pictures are 1 top left to 8 bottom right, picture 3 is the inlet fan with the new accoustic ducting fitted, 4 is where it enters the grow space, 2 is the tape that seals the ducting to the box, 1 is my unfinished exhaust fan with carbon filter and you can see where i drilled the hole for pwer lead to enter on right and the arrow flow direction sticker i transfered from fan to box, 8 is the air exit of the growspace for the exhaust fan, 7 is the exhaust fan with a piece of accoustic matting before i fill it with old cotton t-shirts, 6 is where the inlet duct gets attached to my sealed window box, you can see the light shining in through the duct flange, the window is a top forward tilt and has a patterned white window net and 2 layers of fly screen stretched tight over it with drawing pins and the entire window box is painted matt white inside and so is the inside of the duct where it attaches to the box, the piece of wood sticking out just above the duct is holding the window from tilting forwards and opening and cannot be seen just now from outside through the netting screens, during the day i can vent from the external space between grow room and existing bedroom, if the weather is far too hot or cold, picture 5 shows the cable that leads to a 20 watt monofilament bulb in the bottom corner of the widow box and it looks like a small bedroom lamp from the outside at night when the ducting is attached to it and sucking in, and honestly you would think someone was lying in bed reading a book. and it all is as quiet as a mouse, my fans run from a temperature computer with the fans and a small 2000w blow heater attached and it will keep the room at desired temps no problem with 4 x 600w hps on 20 hours a day.
