---
product_id: 63655078
title: "HMI Hoyme Manufacturing Inc. Motorized Fresh Air Damper for Combustion - 4\" SF2 for Two Heating Appliances"
brand: "hoyme"
price: "€ 763.59"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/63655078-hmi-hoyme-manufacturing-inc-motorized-fresh-air-damper-for-combustion
store_origin: FI
region: Finland
---

# Interlocks with safety systems Energy-saving design 4" duct compatibility HMI Hoyme Manufacturing Inc. Motorized Fresh Air Damper for Combustion - 4" SF2 for Two Heating Appliances

**Brand:** hoyme
**Price:** € 763.59
**Availability:** ✅ In Stock

## Summary

> Breathe Easy, Live Smart! 🌬️

## Quick Answers

- **What is this?** HMI Hoyme Manufacturing Inc. Motorized Fresh Air Damper for Combustion - 4" SF2 for Two Heating Appliances by hoyme
- **How much does it cost?** € 763.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/63655078-hmi-hoyme-manufacturing-inc-motorized-fresh-air-damper-for-combustion)

## Best For

- hoyme enthusiasts

## Why This Product

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

## Key Features

- • **Safety First:** Interconnects with safety control systems for peace of mind.
- • **Patented Innovation:** Proudly patented since 1984, ensuring reliability and compliance.
- • **Versatile Compatibility:** Designed for both residential and commercial HVAC systems.
- • **Effortless Airflow Control:** Seamlessly regulates fresh air for optimal combustion.
- • **Energy Efficiency Champion:** Maximizes comfort while minimizing energy consumption.

## Overview

The HMI Hoyme Manufacturing Inc. Motorized Fresh Air Damper is a cutting-edge solution for controlling fresh air flow in combustion systems. Designed for 4" to 9" insulated air ducts, this patented device interlocks with safety control systems for gas, propane, or oil-fired appliances, ensuring both safety and energy efficiency. Ideal for both residential and commercial HVAC applications, it offers a reliable and innovative approach to modern air management.

## Description

The COMBUSTION FRESH AIR DAMPER, Series 'HOM' is motorized and used for the control of fresh air for combustion. It is patented and Code Certified to be field installed and interlocked with a thermostat of a furnace or aquastat of a boiler, using either oil, propane or natural gas. The damper is placed at the terminating end of an insulated fresh air inlet duct beside the furnace. When the thermostat asks for heat, this motorized damper opens to allow fresh air for complete combustion. When the furnace stops, the damper closes to prevent the entry of unnecessary cold air. This results in added comfort with a definite saving of fuel. Hoyme series ‘SF1’ dampers are used in single furnace applications, series ‘SF2’ dampers are used in dual furnace applications. HMI HOYME dampers and accessories are internationally certified by the Canadian Standards Association (CSA) to include both the United States and Canada. "A Qualified Contractor should be consulted regarding air supply requirements."

## Features

- Controls the flow of Fresh Air for Combustion and attaches to the terminating end of an Insulated Air Duct 4" to 9" in increments of 1"
- Proudly Patented and Code Approved since 1984, specifically for the American & Canadian Residential and Commercial HVAC Industries
- Interlocks to Safety Control Systems of Gas, Propane or Oil-Fired Appliances using Millivolt DC, 24VAC and/or 120Vac
- Inter-connects with other Inline Fresh Air Control Dampers providing Safety and Comfort while saving energy at the same time
- Use type HOM-'SF1' for one appliance, HOM-'SF2' for two appliances or mount in "Tandem" for larger appliances

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Hoyme |
| Part Number | HOM-0x12-SF2 |
| Item Weight | 6 pounds |
| Product Dimensions | 7 x 5.5 x 11.5 inches |
| Item model number | HOM-0412-SF2 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![HMI Hoyme Manufacturing Inc. Motorized Fresh Air Damper for Combustion - 4" SF2 for Two Heating Appliances - Image 1](https://m.media-amazon.com/images/I/81l6gJybsuL.jpg)
![HMI Hoyme Manufacturing Inc. Motorized Fresh Air Damper for Combustion - 4" SF2 for Two Heating Appliances - Image 2](https://m.media-amazon.com/images/I/51OxzH7dvdL.jpg)

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**Shop now:** [https://www.desertcart.fi/products/63655078-hmi-hoyme-manufacturing-inc-motorized-fresh-air-damper-for-combustion](https://www.desertcart.fi/products/63655078-hmi-hoyme-manufacturing-inc-motorized-fresh-air-damper-for-combustion)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-16*