Chimney Block Off Plate: A Must-Have For Every Homeowner

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As a homeowner, it’s crucial to prioritize the safety and maintenance of your chimney. One essential component that every chimney should have is a chimney block off plate. In this article, we will explore the importance of a chimney block off plate and how it can benefit you in ensuring the longevity and efficiency of your chimney system.

What is a Chimney Block Off Plate?

A chimney block off plate, also known as a chimney plug or damper seal, is a device designed to seal off the chimney flue when not in use. It is typically made of durable materials such as stainless steel or cast iron to withstand the high temperatures and harsh conditions inside the chimney.

Why is a Chimney Block Off Plate Important?

1. Energy Efficiency: By using a chimney block off plate, you can prevent warm air from escaping through the chimney when your fireplace is not in use. This helps in conserving energy and reducing your heating bills.

2. Draft Prevention: When a chimney is left open, it can create a draft that pulls cold air into your home. By sealing off the chimney flue with a block off plate, you can prevent cold drafts from entering your living space, thus enhancing your comfort.

3. Moisture Protection: A chimney block off plate acts as a barrier against moisture, preventing rainwater, snow, and other elements from entering your chimney. This helps in preventing the deterioration of the chimney structure and potential water damage to your home.

Types of Chimney Block Off Plates

There are several types of chimney block off plates available in the market to suit different chimney systems:

1. Top-Mount Damper Block Off Plates:

This type of block off plate is installed at the top of the chimney, replacing the traditional chimney damper. It provides an airtight seal and can be operated easily with a handle or cord.

2. Throat-Sealing Damper Block Off Plates:

These block off plates are installed at the throat of the chimney, just above the firebox. They effectively seal off the flue when not in use and can be controlled manually or automatically.

3. Chimney Balloon Block Off Plates:

Chimney balloons are inflatable block off plates that can be inserted into the chimney flue. They are an affordable and temporary solution for blocking off the chimney but may require frequent replacement.

How to Install a Chimney Block Off Plate?

It is recommended to hire a professional chimney technician to install a chimney block off plate. They have the expertise and knowledge to ensure proper installation and a tight seal. However, if you have some DIY skills, you can choose to install a chimney block off plate yourself by following the manufacturer’s instructions carefully.


A chimney block off plate is an essential component for maintaining the efficiency, safety, and longevity of your chimney system. By investing in a high-quality chimney block off plate and ensuring its proper installation, you can enjoy energy savings, draft prevention, and protection against moisture. Don’t overlook the importance of this small yet significant accessory for your chimney!