Vostermans Multifan HAF Q 20 Inch Greenhouse Circulation Fan - 240V, 4765 CFM

Vostermans Multifan HAF Q 20 Inch HAF Fan for Large Greenhouses

Vostermans builds the Multifan HAF Q 20 to keep air circulating through greenhouses and growing halls. Rated airflow is 4,765 CFM, and the motor runs on a 240V single-phase supply. A HAF fan drives air horizontally over a long distance rather than straight down on the plants. In a row of fans, that stream keeps the whole house moving and evens out warm and cold zones. The motor has an IP55 enclosure rating and class F insulation, as on other Multifan circulation fans. A white housing reflects light and keeps shading over the crop to a minimum. The wire guards are powder-coated steel that meets OSHA requirements. Built-in suspension points take chain, cable or profile mounting from the structure. Reduced-speed running is possible on single-phase models with a TRIAC, SCR or transformer controller. The fan carries a 3-year warranty from Vostermans. Its model code is T4E50K2M81100.

Running Horizontal Airflow Fans Through the Season

Large houses need a continuous chain of fans to keep air moving end to end. Place the first fans near one gable and point them down one side of the house. Point a second line back up the other side so the air returns in a loop. Keep the gap between fans inside the throw distance so the stream does not die out. Hang them above the canopy and below any hanging baskets, with nothing blocking the path ahead. Strong air aimed straight onto plants can stress them, so keep the stream above the leaves. Use chain or cable rated for the fan's weight, fixed to trusses or purlins. Have an electrician wire the fans to local code, with a disconnect for each fan or group. Size any speed controller for the combined current of all the fans on it. Turn the fans down or off while exhaust fans and roof vents are pulling air through the house. At night, keep them running to stop damp, still air settling in the crop and to lower disease risk. Wipe dust from blades and guards on a regular schedule so airflow holds up.

Key Features

• 4,765 CFM Airflow: Long throw for large greenhouses.
• 240V Single-Phase: Reduced-speed capable with a TRIAC, SCR or transformer control.
• IP55 Motor: Protected against dust and water jets.
• Class F Insulation: Motor built for warm greenhouse air.
• White Housing: Keeps shading over the crop low.
• OSHA Steel Guards: Powder-coated, with a 3-year warranty.

Technical Specifications