Step Six Install a Vent

Getting Started In Hydroponics

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A vent fan is necessary in virtually all grow rooms. See Air Ventilation and Air Ducting in Chapter 9 for more information. Most grow rooms require some sort of odor control (see Step Seven, page 146) to keep it secure from cops and robbers. In this case, the fan will need to be more powerful to draw air through a charcoal filter if one is used to clean the air. —

Often one of the biggest obstacles to constructing a grow room is where and how to run the exit ducting with a minimum of work and structural damage.

Construct a ventilation system that brings in cool air to the bottom of the room and expels hot airfrom the top of the room.

Install a vent in the attic

Normally you can run the vent out a window, chimney, sewer vent, or other preexisting exit. Locate the vent in the ceiling or near the ceiling where hot air naturally accumulates. Carefully cut a hole in the wall or ceiling and in the exact place you want it. Smart growers plan the entire project on paper before cutting holes in existing structures.

Use rigid ducting instead of flexible ducting if possible. The larger the ducting the more freely and quietly air will flow out. Choose between 4-, 6-, 8-, 10-, and 12-inch (10, 15, 20, 25, 30 cm) ducting.

If cutting into a ceiling with a crawl space, make sure you have a method to evacuate the grow room air from the crawl space. Install louvers below the rafters on the outside wall of the house.

Cut the hole in the ceiling into the attic or directly through the roof. Go into the attic and measure where the hole will come out. Make sure there are no wires or other impediments before cutting the hole. Pull back insulation above the hole if necessary. Use the ducting or the fan to mark a circle where you want to make the hole. Drill a 1-inch hole near the center of the circle. Use a hand hole saw to cut out the circle just outside the line. Install the vent fan and supply it with electricity. Hide the fan with louvers attached to the ceiling.

Install a vent in the attic

Roof fan interior

Cutting a hole in the roof could cause leaks later. Think before acting and make sure you know what you are doing.

Pipe Insert Into Roof

Tap into ABS plastic sewer drain vents and insert the extraction vent. Make sure that you are tapping into the ventilation pipe rather than the actual sewer pipe. Install a backflow vent in the extraction duct so that foul-smelling odors do not invade the grow room.

Run ventilation ducting into the chimney.

Roof fan interior

Tap into ABS plastic sewer drain vents and insert the extraction vent. Make sure that you are tapping into the ventilation pipe rather than the actual sewer pipe. Install a backflow vent in the extraction duct so that foul-smelling odors do not invade the grow room.

Cutting a hole in the roof could cause leaks later. Think before acting and make sure you know what you are doing.

Run ventilation ducting into the chimney.

NOTE: Before completing any of these jobs, discuss the project with a professional at the building supply store. The author and the publisher do not take any responsibility whatsoever for damages that may be caused by installing ventilation.

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Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

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  • Bryce Alexander
    How to vent a grow room through a window?
    10 months ago

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