Using light deprivation to control plant growth and blooming is a trending strategy for short-day plants, such as cannabis and poinsettias. Without proper ventilation during the light deprivation stage, heat, mold, and disease can quickly destroy your crop, setting you back a whole season. J&D’s WM Light Dep Exhaust Fan is a crucial piece of your greenhouse light deprivation system for healthy, robust, and profitable blooms.

• Allows for bigger, higher quality, larger profit flowers
• Full range of sizes, even ones for small greenhouses
• Test data is for fan with light trap, enabling dependable and accurate air exchange calculations
• Fan with light trap mounts flush to the interior of the building, freeing up valuable space and eliminating a protruding ledge

Specifications

Standard/Belt Drive Motor

Gold Star Motor

Technical Information

WM Light Dep Exhaust Fan Technical Specifications (PDF)

Additional Information

How do I size my fan and shutters system?

1. The first thing that you need to determine is the amount of air required. This is stated in CFM (Cubic Feet of Air per Minute).
2. Use the following formula to determine the CFM required for your greenhouse:
   CFM = Length x Width x 12
   Example: Greenhouse 12′ wide and 24′ long requires 3456 CFM (12 x 24 x 12)
3. Reference the above table. Select the appropriate combination of fan(s) to achieve the necessary CFM rating. Be sure to match the total CFM output for your exhaust fan(s) to the CFM ratings for your Inlet Shutters.

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