Homebox L (the Original) 

This portable alternative to building a permanent grow room is extremely affordable. You can assemble the Homebox L (the Original Homebox) in about 20 minutes without any tools! Dismantling is just as fast and simple, making it ideal for seasonal crops. 

The Homebox L has a metal frame with strong nylon push-lock corners for sturdiness. The tent is a tear-proof canvas that blocks light and air. The interior has tough reflective white PE to help "spread the light". There's even a removable floor that's water-resistant and washable.

The top-to-bottom zipper, combined with the side-to-side zippers at the floor and roof, gives you easy access to your garden. Once assembled, you have an indoor greenhouse that is completely sealed and virtually light proof.

The upper frame of the Homebox L provides fastening pieces that supports your grow light reflector (NO built-in ballasts please). The roof area comes with an attachment to mount your exhaust fan and filter, plus a 6-inch outlet sleeve for ducting the fan exhaust.

Ventilation holes are located at the bottom of the grow closet - by utilizing an exhaust fan and charcoal filter at the top, the Homebox L gives you a chimney drafting effect to prevent odors while providing needed air circulation.

Openings:

Roof = 200mm
Rear Top = 90mm
Right Bottom = 160mm

Dimensions: 39.5" wide x 39.5" deep x 78.75" tall
Weight: 25 lbs.

If using HID lighting, sufficient ventilation must be used to exhaust heat.

More info from the Manufacturer (PDF format - Lots of detail.)