Durablow WiFi Smart Crawl Space Vent Fan, model number MFB M2D-SH (ZF). This is a Durablow branded crawl space vent fan that offers WiFi enabled smart features. This Durablow WiFi Smart Crawl Space Vent Fan is being sold "As-Is". Durablow 220 CFM WiFi Smart Crawl Space Vent Fan, Dual Fans with Dehumidistat & Thermostat, Works with Alexa, Google Assistant, Siri, Foundation Vent, Radon Mitigation (Stainless Steel Silver,M2D-SH)