---
product_id: 1149280
title: "Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM"
brand: "tjernlund"
price: "$483.90"
currency: USD
in_stock: true
reviews_count: 8
category: "Tjernlund"
url: https://www.desertcart.us/products/1149280-tjernlund-v1d-underaire-crawlspace-ventilator-fan-moisture-mold-reducing-110
store_origin: US
region: United States of America
---

# 20W energy-efficient 110 CFM airflow Adjustable fit Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM

**Brand:** tjernlund
**Price:** $483.90
**Availability:** ✅ In Stock

## Summary

> 🌬️ Breathe Easy, Live Better!

## Quick Answers

- **What is this?** Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM by tjernlund
- **How much does it cost?** $483.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/1149280-tjernlund-v1d-underaire-crawlspace-ventilator-fan-moisture-mold-reducing-110)

## Best For

- tjernlund enthusiasts

## Why This Product

- Trusted tjernlund brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Maintenance-free design with freeze protection for year-round reliability.
- • **Smart Humidity Control:** Equipped with an adjustable dehumidistat for optimal moisture management.
- • **Effortless Installation:** Easily fits standard and non-standard openings.
- • **Transform Your Crawl Space:** Say goodbye to musty odors and hello to fresh air!
- • **Energy Efficient Performance:** Only 20 watts for powerful ventilation without the high energy bill.

## Overview

The TjernlundV1D UnderAire Crawlspace Ventilator Fan is designed to effectively power ventilate damp and musty crawl spaces. With a robust airflow of 110 CFM and an energy-efficient 20-watt motor, this fan includes an adjustable dehumidistat and freeze protection, ensuring optimal performance in any climate. Its versatile faceplate can be trimmed to fit various foundation openings, making it a practical solution for maintaining a healthy home environment.

## Description

One fan and large face-plate sized for ventilation openings through block foundations. Includes thermostat, dehumidistat and pre-wired 6" power cord.

Review: Great Unit - Used in crawl space. Installed below patio, has slight hum if you are listening for it, but we don’t even notice it. Been installed 4 months with no problems, runs continuously, we do not use timed feature.
Review: Do you have an outlet in your crawl space? - Very well made and effective. It mounts easily and discretely below the house and you can basically set it and forget it. I work in water damage repair and ventilation under a house is key. This low power constant negative is perfect for setting up a gentle cross draft. I mounted this with some rubber grommets over the screws and some foam weatherstripping around the edges to reduce vibration /sound. Worked perfect and gives it an airtight seal to maintain negative draw in the crawl space.

## Features

- Power ventilate musty, damp crawl spaces through existing passive vents
- Faceplate is sized for ventilation openings through standard block foundations
- 110 CFM, 20 watt maintenance free exhaust fan.
- Includes adjustable dehumidistat, freeze protection limit and 6 foot grounded power cord
- Faceplate can be trimmed to match non-standard foundation openings

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000N503CM |
| Air Flow Capacity | 110 Cubic Feet Per Minute |
| Best Sellers Rank | #85,035 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #121 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 223 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 |
| Is Product Cordless | No |
| Item Dimensions D x W x H | 12.9"D x 20"W x 3"H |
| Item Type Name | ventilation fan |
| Item Weight | 5.36 Pounds |
| Main Power Connector Type | NEMA 1-15P |
| Manufacturer | Tjernlund |
| Material | Alloy Steel |
| Model Name | V1D |
| Model Number | V1D |
| Motor Type | brushless |
| Mounting Type | Crawl |
| Number of Power Levels | 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 |
| Smart Home Compatibility | Not Smart Home Compatible |
| Special Features | Lightweight |
| Style | With Dehumidistat |
| Theme | Ventilation |
| UPC | 080956954046 |
| Unit Count | 1.0 Count |
| Voltage | 120 Volts |
| Wattage | 20 watts |

## Product Details

- **Brand:** Tjernlund
- **Color:** Silver
- **Electric fan design:** Exhaust Fan
- **Power Source:** Corded Electric
- **Style:** With Dehumidistat
- **Product Dimensions:** 12.9"D x 20"W x 3"H
- **Room Type:** crawlspace
- **Special Feature:** Lightweight
- **Recommended Uses For Product:** Air Circulation
- **Wattage:** 20 watts

## Images

![Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM - Image 1](https://m.media-amazon.com/images/I/713ARsXY6vL.jpg)
![Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM - Image 2](https://m.media-amazon.com/images/I/71twFhuCLSL.jpg)
![Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM - Image 3](https://m.media-amazon.com/images/I/713ksmkxG6L.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: Is this available in 60Hz 240V?**
A: I don't know about the 60 hz 240 volt

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

**Q: will this fan work in a basement 800 sq ft  X 6' ?**
A: I'm not sure about the dimensions but overall the fan works well.

**Q: Is fan reversible?**
A: do not know if fan is reversible, but I know it never shut off all summer and all of fall

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Unit
*by B***N on March 18, 2024*

Used in crawl space. Installed below patio, has slight hum if you are listening for it, but we don’t even notice it. Been installed 4 months with no problems, runs continuously, we do not use timed feature.

### ⭐⭐⭐⭐⭐ Do you have an outlet in your crawl space?
*by J***O on January 6, 2015*

Very well made and effective. It mounts easily and discretely below the house and you can basically set it and forget it. I work in water damage repair and ventilation under a house is key. This low power constant negative is perfect for setting up a gentle cross draft. I mounted this with some rubber grommets over the screws and some foam weatherstripping around the edges to reduce vibration /sound. Worked perfect and gives it an airtight seal to maintain negative draw in the crawl space.

### ⭐⭐⭐⭐⭐ Love it! Does the job.
*by U***K on September 17, 2016*

Love it. Installed fan in a space under my front steps with the gas meter, electric meter, and oil tank. Floor is part of the (brick) house slab. Had always been higher humidity than the rest of the living space or outside. Now it tracks outside humidity. Fan is 110 CFM so it makes a little noise. Not a problem as this space is closed off. I did run a bead of caulk around the plate before installing (probably not really needed). Make sure it's installed tightly so it does not rattle. I like the long slots for mounting; makes it easy to find a spot to attach each corner. Had to run a short conduit and put in a (GFCI) outlet as the cord is only 6' long.

## Frequently Bought Together

- Tjernlund V1D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing, 110 CFM
- Tjernlund 950-8304 Underaire Steel Crawl Space Vent, Steel Diamond Pattern, 18" x 10" Screen
- Witten Automatic Vent B-EBLACK(MB) "Energy-Saver" Foundation Auto Vent 8" X 16"- Black

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/1149280-tjernlund-v1d-underaire-crawlspace-ventilator-fan-moisture-mold-reducing-110](https://www.desertcart.us/products/1149280-tjernlund-v1d-underaire-crawlspace-ventilator-fan-moisture-mold-reducing-110)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-06-03*