Is this available in 60Hz 240V?

I don't know about the 60 hz 240 volt

Will this work in crawling space of an attic? Crawling space size is approximately 75 sq ft.

I don’t see why it wouldn’t... it has a humidistat to automatically regulate the moisture. It only turns on when needed to suck out the humid air. Just keep in mind that you don’t want another vent or space open to the humid air, or it will just keep the problem going by sucking in moist air...

will this fan work in a basement 800 sq ft X 6' ?

I'm not sure about the dimensions but overall the fan works well.

do not know if fan is reversible, but I know it never shut off all summer and all of fall

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V1D

Product ID: 1149280

Details

Brand
Tjernlund
Color
Silver
Electric fan design
Exhaust Fan
Mounting Type
Crawl
Power Source
Corded
Product Dimensions
12.9"D x 20"W

⚡20 watt energy efficient

💨110 CFM airflow power

🛠️Adjustable dehumidistat & freeze protection

4084133Ar

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Description

💨 Elevate your crawlspace game—breathe fresher, live smarter!

SMART CLIMATE CONTROL - Built-in adjustable dehumidistat keeps humidity in check automatically
ENERGY SAVVY OPERATION - Low 20 watt draw means powerful ventilation without the high electric bill
BREATHE EASY MOLD FREE - Power ventilates damp crawlspaces to slash moisture buildup
TAILORED FIT NO HASSLE - Faceplate trims to fit non-standard foundation vents perfectly
PLUG PLAY INSTALLATION - Pre-wired 6-foot grounded cord for quick, maintenance-free setup

The Tjernlund V1D UnderAire is a high-performance 110 CFM exhaust fan designed specifically for crawlspace ventilation. Featuring a large, trim-to-fit faceplate for standard or custom foundation openings, it includes an adjustable dehumidistat and freeze protection to maintain optimal moisture levels. Operating at just 20 watts with a brushless motor, it ensures energy-efficient, maintenance-free air circulation to reduce mold and dampness in crawlspaces.

Specifications

ASIN	B000N503CM
Air Flow Capacity	110 cfm
Best Sellers Rank	#94,256 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #203 in HVAC Ducting
Blade Material	Plastic
Brand	Tjernlund
Brand Name	Tjernlund
Collection Name	Crawlspace Fans
Color	Silver
Control Method	Touch
Controller Type	Button Control
Customer Reviews	4.6 out of 5 stars 225 Reviews
Electric Fan Design	Exhaust Fan
Electric fan design	Exhaust Fan
Finish Type	Silver, likely Painted or Brushed
Global Trade Identification Number	00080956954046
Included Components	Cord
Indoor Outdoor Usage	Indoor
Installation Type	Crawlspace
Item Dimensions D x W x H	12.9"D x 20"W x 3"H
Item Type Name	ventilation fan
Item Weight	5.4 pounds
Main Power Connector Type	NEMA 1-15P
Manufacturer	Tjernlund
Material	Wood
Model Name	V1D
Model Number	V1D
Motor Type	brushless
Mounting Type	Crawl
Number of Power Levels	1
Number of Speeds	1
Part Number	V1D
Power Source	Corded Electric
Product Dimensions	12.9"D x 20"W x 3"H
Recommended Uses For Product	Air Circulation
Room Type	crawlspace
Size	110 CFM
Special Features	Lightweight
Style	With Dehumidistat
UPC	080956954046
Unit Count	1 Count
Voltage	120 volts
Wattage	20 watts

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