---
product_id: 21971091
title: "Tjernlund DB-2 Duct Booster, Increases Heating and Cooling Power, 275 CFM"
brand: "tjernlund"
price: "1195.38 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Tjernlund"
url: https://www.desertcart.tn/products/21971091-tjernlund-db-2-duct-booster-increases-heating-and-cooling-power
store_origin: TN
region: Tunisia
---

# 275 CFM airflow 1550 RPM motor speed Fits 5-8 inch ducts Tjernlund DB-2 Duct Booster, Increases Heating and Cooling Power, 275 CFM

**Brand:** tjernlund
**Price:** 1195.38 DT
**Availability:** ✅ In Stock

## Summary

> 💨 Elevate your airflow, elevate your comfort—don’t let stagnant air hold you back!

## Quick Answers

- **What is this?** Tjernlund DB-2 Duct Booster, Increases Heating and Cooling Power, 275 CFM by tjernlund
- **How much does it cost?** 1195.38 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/21971091-tjernlund-db-2-duct-booster-increases-heating-and-cooling-power)

## 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 modest 55 dB, delivering strong airflow without the noise pollution.
- • **Boost Your Airflow Game:** 275 CFM max airflow powers up your heating & cooling efficiency instantly.
- • **Built to Last, Made in USA:** Durable galvanized steel housing with UL listing ensures reliable, long-term performance.
- • **Precision Fit for Any Duct:** Seamlessly fits round ducts 5-8 inches and rectangular ducts as shallow as 3.25 inches.
- • **Easy Installation, Instant Impact:** Includes mounting template and installs with just 4 screws—upgrade your comfort in no time.

## Overview

The Tjernlund DB-2 Duct Booster is a robust inline centrifugal fan designed to increase airflow in heating and cooling ducts. With a powerful 275 CFM capacity, 1550 RPM motor, and compatibility with 5 to 8 inch round or shallow rectangular ducts, it enhances HVAC efficiency quietly and reliably. Constructed from galvanized steel and UL listed, this American-made booster is easy to install and built for lasting 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.

Review: Does its job - Booster was easy to install. Works well. I should have went with the next level up. Great if you want to boost a duct close to a register. The 25-30ft I needed it to go is just a tad too far. It has increased the flow but would like to have had more. The noise is ok. Typical of an electric fan.
Review: It works ! - Works amazing. Definitely helps with air flow in the hard to reach places

## 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 | #231,797 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #778 in Household Ventilation Fans |
| Blade Length | 8 Inches |
| Blade Material | Plastic |
| Brand | Tjernlund |
| Brand Name | Tjernlund |
| Collection Name | Tjernlund Original Duct Booster - DB-2 |
| Color | Multicolored |
| Control Method | Touch |
| Controller Type | Button Control |
| Customer Reviews | 4.4 out of 5 stars 217 Reviews |
| Electric Fan Design | Exhaust Fan |
| 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 | 55 Decibels |
| Number of Power Levels | 1 |
| Part Number | DB-2 |
| Power Source | Corded Electric |
| Product Dimensions | 11.5"D x 11.5"W x 11.5"H |
| Recommended Uses For Product | Cooling, Exhausting |
| Reusability | Typical |
| Size | 5 to 8 inches (duct diameter), 7 inches (length) |
| Smart Home Compatibility | Not Smart Home Compatible |
| 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, Increases Heating and Cooling Power, 275 CFM - Image 1](https://m.media-amazon.com/images/I/51Q3xuqO2TL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does its job
*by C***R on May 13, 2026*

Booster was easy to install. Works well. I should have went with the next level up. Great if you want to boost a duct close to a register. The 25-30ft I needed it to go is just a tad too far. It has increased the flow but would like to have had more. The noise is ok. Typical of an electric fan.

### ⭐⭐⭐⭐⭐ It works !
*by F***D on May 4, 2026*

Works amazing. Definitely helps with air flow in the hard to reach places

### ⭐⭐⭐⭐ Nice Blower / Booster
*by B***E on March 2, 2014*

It is a nice fan...it makes a little bit of noise..needs to be carefully installed to avoid vibration in ducts/ walls etc... I used it for a drywall cavity ( return )..and after I messed around with the set up, the noise was not too bad. I would say it doesn't add much noise to the existing AC noise kev. It is especially useful for shallow ducts...where the more high tech booster fans dont fit ..

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-06-22*