---
product_id: 21971091
title: "Tjernlund DB-2 Duct Booster Fan for Heating and Cooling Airflow, 275 CFM | Duct booster fan delivers up to 275 CFM to improve heating and cooling airflow in compatible duct systems; verify sizing."
brand: "tjernlund"
price: "€ 382.67"
currency: EUR
in_stock: true
category: "Tjernlund"
url: https://www.desertcart.hr/products/21971091-tjernlund-db-2-duct-booster-fan-for-heating-and-cooling
store_origin: HR
region: Croatia
---

# 275 CFM airflow Rated for up to 200°F inlet temp Fits 5-8 inch ducts & shallow 3.25 inch rectangular Tjernlund DB-2 Duct Booster Fan for Heating and Cooling Airflow, 275 CFM | Duct booster fan delivers up to 275 CFM to improve heating and cooling airflow in compatible duct systems; verify sizing.

**Brand:** tjernlund
**Price:** € 382.67
**Availability:** ✅ In Stock

## Summary

> 💨 Elevate your comfort zone with airflow that means business!

## Quick Answers

- **What is this?** Tjernlund DB-2 Duct Booster Fan for Heating and Cooling Airflow, 275 CFM | Duct booster fan delivers up to 275 CFM to improve heating and cooling airflow in compatible duct systems; verify sizing. by tjernlund
- **How much does it cost?** € 382.67 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/21971091-tjernlund-db-2-duct-booster-fan-for-heating-and-cooling)

## 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

- • **Quiet Yet Powerful:** Operates at a whisper-quiet 45 decibels, so comfort doesn’t come with noise.
- • **Easy Pro Installation:** Includes mounting template and installs with just 4 screws—upgrade your airflow without hassle.
- • **Boost Your Airflow Game:** 275 CFM max airflow powers up your heating & cooling efficiency instantly.
- • **Built to Withstand Heat:** Rated for inlet temps up to 200°F, perfect for demanding HVAC environments.
- • **Versatile Fit for Any Duct:** Seamlessly fits round ducts 5-8 inches and rectangular ducts as shallow as 3.25 inches—no duct left behind.

## Overview

The Tjernlund DB-2 Duct Booster is a robust inline centrifugal fan designed to increase heating and cooling efficiency by delivering up to 275 CFM airflow. Engineered to fit both round (5-8 inch) and shallow rectangular ducts (as little as 3.25 inches deep), it features a galvanized steel housing and a quiet, permanently lubricated motor rated for inlet temperatures up to 200°F. UL listed and easy to install, this US-made booster is the smart upgrade for professionals seeking optimized HVAC performance.

## Description

Inline Duct Booster, Housing Material Galvanized Steel, Fits Duct Dia. 5 to 8 In., Voltage 115, Max. Amps 0.51, Max. Wattage 40, Number of Speeds 1Length 7 In. CFM at 0.000-In. SP 275Max. Inlet Temp. 200 Degrees F, Inlet and Outlet Dia. 5 to 8 In., 60 Hz, 1 Phase Motor RPM 1550, Motor Enclosure Totally Enclosed, Width 9-1/2 In., Height 8-3/4 In. Speed Control Yes Mounting Position Horizontal Includes Mounting Template Restrictions Note: cfm rating is for 8" dia. pipe. Air flow will decrease slightly with smaller pipe. In-Line Centrifugal Fan Duct Booster fits in round, square, or flat ducts as shallow as 3-1/4" deep. One 4" x 7" cutout is required. Unit attaches to ductwork with 4 sheet metal screws. May be actuated by 5C968 pressure switch. Steel housing and wheel. 1/70 HP, 1550 rpm, 115V, 60 Hz permanently lubricated motor is positioned out of the air stream. UL Listed. Max. operating air temp.: 200 F; not for use with combustion exhaust Motor shaft should remain horizontal to the floor; mount on bottom of horizontal or side of vertical duct.

## Features

- Fits 5 to 8 Inch Round Duct
- Fits Rectangular Duct as Shallow as 3.25 Inches
- Rated to 200F
- Country of origin: United States

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000LDEUGQ |
| Air Flow Capacity | 275 Cubic Feet Per Minute |
| Best Sellers Rank | #111,194 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #434 in Household Ventilation Fans |
| Blade Length | 8 Inches |
| Blade Material | Plastic |
| Brand Name | Tjernlund |
| Collection Name | Tjernlund Original Duct Booster - DB-2 |
| Color | Multicolored |
| Control Method | Touch |
| Controller Type | Button Control |
| Customer Reviews | 4.4 4.4 out of 5 stars (218) |
| Electric Fan Design | Exhaust Fan |
| Finish Type | Galvanized Steel |
| Global Trade Identification Number | 00080956401007 |
| Included Components | Mounting Template |
| Indoor Outdoor Usage | Indoor |
| Installation Type | built-in |
| Is Product Cordless | No |
| Item Dimensions D x W x H | 11.5"D x 11.5"W x 11.5"H |
| Item Weight | 4 Pounds |
| Main Power Connector Type | Electrical Cable |
| Manufacturer | Tjernlund |
| Material | Alloy Steel |
| Model Name | Tjernlund Original Duct Booster - DB-2 |
| Model Number | DB-2 |
| Motor Type | AC |
| Mounting Type | Free Standing |
| Noise Level | 45 Decibels |
| Number of Power Levels | 1 |
| Part Number | DB-2 |
| Power Source | Corded Electric |
| Recommended Uses For Product | Cooling, Exhausting |
| Reusability | Typical |
| Size | 5 to 8 inches (duct diameter), 7 inches (length) |
| Specification Met | UL |
| Speed | 1550 RPM |
| Style | Round Duct |
| Theme | Modern |
| UPC | 080956401007 |
| Unit Count | 1.0 Count |
| Voltage | 115 Volts |
| Wattage | 70 watts |

## Product Details

- **Brand:** Tjernlund
- **Color:** Multicolored
- **Controller Type:** Button Control
- **Electric fan design:** Exhaust Fan
- **Material:** Alloy Steel
- **Mounting Type:** Free Standing
- **Power Source:** Corded Electric
- **Product Dimensions:** 11.5"D x 11.5"W x 11.5"H
- **Recommended Uses For Product:** Cooling, Exhausting
- **Style:** Round Duct

## Images

![Tjernlund DB-2 Duct Booster Fan for Heating and Cooling Airflow, 275 CFM | Duct booster fan delivers up to 275 CFM to improve heating and cooling airflow in compatible duct systems; verify sizing. - Image 1](https://m.media-amazon.com/images/I/51Q3xuqO2TL.jpg)

## Available Options

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

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**Shop now:** [https://www.desertcart.hr/products/21971091-tjernlund-db-2-duct-booster-fan-for-heating-and-cooling](https://www.desertcart.hr/products/21971091-tjernlund-db-2-duct-booster-fan-for-heating-and-cooling)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-10*