The AlorAir VentirMax 780S is the largest knob-controlled VentirMax, exhausting 780 CFM through a foundation vent for crawl spaces up to 1,300ft². Its stainless steel housing is built for large, damp spaces.
The humidistat knob runs the fan above your chosen humidity, and a thermostat stops it below 37°F outdoors. It draws 0.65 A at 115 V and pairs an IP55 motor with a stainless insect screen.
Features
780 CFM Exhaust
Moves 780 CFM on 0.65 A at 115 V, rated by AlorAir for up to 1,300ft² of crawl space.
Humidistat Knob
Set 10% to 80% RH; the fan runs whenever humidity is above your setting and stops when the space dries.
Freeze Protection
A built-in thermostat stops the fan below 37°F outdoors and lets it restart as temperatures near 50°F.
Stainless Steel Housing
A stainless body and IP55 rated motor made for the constant humidity of a crawl space or basement.
Stainless Insect Screen
Keeps pests larger than 0.3" out of the fan and the crawl space.
Mounts Over the Vent
The metal plate fixes over an existing foundation vent with four screws, and can be trimmed to fit the opening.
Specifications
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Model: VentirMax 780S
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Airflow: 780 CFM
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Coverage: Up to 1,300ft²
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Voltage: 115 V, 60 Hz
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Rated Current: 0.65 A
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Controls: Humidistat knob, 10% to 80% RH
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Freeze Protection: Stops below 37°F outdoors, restarts near 50°F
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Motor Protection: IP55
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Insect Screen: Stainless steel
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Housing: Stainless steel
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Power Cord: 6'
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Noise: Less than 55 dBA
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Dimensions: 16.1"L x 11.9"W x 4.4"H
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Weight: 9 lbs
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Certifications: ETL
What's Included
- AlorAir VentirMax 780S ventilation fan with mounting plate
- 4 wall anchors and 4 machine screws
- Installation and user manual
Setup & Placement
Install it behind an existing foundation vent, at least 3' from a corner of the building, with the control box and motor facing into the crawl space. You need a grounded outlet within 6' and a 5/16" nut driver; add a drill with a 5/16" masonry bit for brick or block.
Remove the existing vent cover, place the fan in front of the vent and mark the four corners of the metal plate. On block or brick, drill 5/16" holes, fit the wall anchors and fix the plate with four screws; on wood framing or an existing vent, use screws and nuts. On SD models, set the humidity and temperature triggers after power-up: they ship at 50% RH and 86°F.
Resources
Shipping, Returns & Warranty
Ships direct from AlorAir's U.S. warehouse, with free shipping on orders over $100.
Inspect the packaging and the product before you sign. Note any damage or shortage on the delivery receipt, then email photos to support@mycleansupplies.com within 48 hours of delivery so the freight claim can be filed. Damage reported after 48 hours can't be claimed.
Unused AlorAir equipment in its original packaging can be returned within 21 days of delivery. Ask us for a return authorization before you ship. Returns that aren't due to a defect carry AlorAir's 20% restocking fee, and you pay the return shipping. If the unit is defective, AlorAir covers the return shipping. Payment processing fees are not refunded. Used or contaminated units and special-order items can't be returned.
Backed by AlorAir's 12-month limited warranty from the date of delivery, covering defects in materials and workmanship. AlorAir handles warranty service directly, so keep your proof of purchase and the original packaging.
About AlorAir
AlorAir Solutions is based in Chino, California, and supplies dehumidifiers, ventilation fans and air scrubbers for crawl spaces, basements and restoration work. Its crawl space ventilation fans mount over an existing foundation vent and run on their own controls to move damp air out from under the house.
The VentirMax series is AlorAir's stainless steel crawl space fan line, in knob-controlled S and programmable SD versions. The VentirPro series offers knob control in aluminum-zinc or stainless housings, and the VentirPro-S2 uses two DC fans with an external probe. For a sealed, encapsulated crawl space, AlorAir's Sentinel dehumidifiers are the alternative to ventilation.
