Garage heater horizontal venting

Garage Heater Venting Vertical Or Horizontal: Looking For The Better Option?

The car engine doesn’t seem to start in winter easily due to the cold temperature. It’s pretty frustrating, right?

To avoid this problem, you can install a heater in your garage. It will keep your cars warm. If you want to install a heater, you must make a venting system. 

You might wonder whether the garage heater venting is vertical or horizontal

Both vertical and horizontal venting are used for the ventilation system. It’s less expensive and the user can install the system on their own. But it requires a hole in the ceiling or roof. Horizontal venting is a little expensive and requires professional help. But it lasts long.

We’ll be discussing vertical and horizontal ventilation. Stay with us till the end. We can help you find the one that’s perfect for you.

Why is Ventilation of the Garage Heater Important?

If they are not correctly ventilated out of the garage, they can seriously hurt anybody. So, garage heater ventilation is really important. 

The heater has to be set to the ceiling or to the wall. After setting the heater, you have to install the ventilation. 

You can do it in two modes. Those are typical combustion modes. 

In the typical mode, the heater is drawing the air from the place. It’s exhausting through a flow to the outside. In the combustion mode, the heaters draw in fresh air from the outside and then also exhaust to the outside through a flow. Ventilation can be installed in Vertical and Horizontal ways. 

Vertical Ventilation

You can set the ventilation system vertically. This is one of the most used methods. The technique of releasing heat, gas, and smoke to rise up and leave a structure is known as vertical ventilation. 

This is done by installing vents or using already-existing holes in the house roof. It’s less costly. You can set the heater on the wall or ceiling by cutting a hole in them. 

Set the heater on the hole and attach the gas pipes to the heater. 

Place the gas pipes outside of your house. So that the gas pipes can exhaust the toxic gasses outside your home. 

For vertical ventilation, a 3″ to 4″ adapter and adjustable roof flashing are needed. The adapter can be used with MHU75. You might need to add more stuff in order to follow the local code. 

All these can be bought for $117.

Horizontal Ventilation

Installing a venting system horizontally is also one of the best options. The companies produce garage heaters in a way that makes it easier to set ventilation horizontally. 

It’s a perfect way of ventilation for those who don’t have a roof in their garage. You can set up ventilation horizontally on the wall. This horizontal ventilation lasts for a lifetime. 

You will need an Adjustable elbow, Adapter, B-vent pipe, 2 vent pipes, and a 90° elbow for horizontal ventilation. You might also need a Wall thimble, Roof flashing, Storm collar, and Vent cap afe. 

This kit can be bought for $399.

Advantages & Disadvantages Of Vertical Ventilation

Garage heaters can be installed in a vertical way. This is the widely used method. However there are some disadvantages of vertical ventilation. 

Let’s see the advantages and disadvantages of vertical ventilation.


Vertical ventilation is easy to install. It’s also cost-effective. All you have to do is make a hole in the roof or ceiling and flash it properly. 

The kits that you need to install are also pretty cheap. They are easier to find. 

You can install the vertical venting of the heater if you have all the equipment. You can even use epoxy to set the outer part of the ventilation system

This sort of ventilation is arguably the most effective since it quickens the natural process. Vertical ventilation improves the safety and clarity of the interior environment. 

This ventilation system reduces, prevents, or stops the mushrooming of gasses and smoke.


Vertical ventilation has disadvantages. There’s a chance that the building or roof may collapse. You might fall off the roof while installing the heater. You have to make a hole in the ceiling or roof. 

So, vertical ventilation takes a longer time to install. Also, it takes much time to remove in case of emergency. 

Advantages & Disadvantages Of Horizontal Ventilation

Users are choosing this technique over vertical venting for its efficiency. The advantages and disadvantages of horizontal ventings are discussed below.


Horizontal ventilation doesn’t require any holes in the ceilings. You can install the heater on the wall and it will provide the heat. You have to use gas pipes for exhausting the gas from the garage. 

This type of ventilation can provide more heat than vertical ventilation. This horizontal garage heater ventilation can keep your cars warm in the garage. 

Even firemen prefer this horizontal ventilation over vertical ventilation. It’s been said that horizontal ventilation is safer than vertical ones. Once the heater ventilation is installed, it will last for a lifetime.


This ventilation should be done by professionals. This technique could be a little expensive. The kits that are used to install this ventilation are also expensive. This technique is one of the complex techniques. 

Thus, horizontal ventilation is only installed when vertical ventilation installment becomes impossible.

Which One Suits You Better?

Both Vertical and Horizontal ventilation has their own pros and cons. These ventilation systems are equally important depending on the situation. The users have been using both of the techniques. 

Let’s see which one suits you better.

So, if you want a less costly and easy installment, you should go for vertical ventilation. Keep in mind you have to make a hole in your roof for this technique. 

On the other hand, horizontal ventilation is a bit expensive. If you’re okay with paying a little money and avoiding cutting holes, go for the horizontal technique. This type of ventilation installment doesn’t require that much servicing.  

Make sure your ceiling is properly insulated so that the heat stays inside the garage.


Can B Vent Be Used Horizontally?

It is not possible to install the Type B or single-wall vent connection horizontally. It can be run virtually horizontally: 1/4″ per foot slope upward toward the vent. But no dips or sags (IRC G2427. 10.7). It must connect to a vertically terminating vent.

Can You Vent A Garage Heater Through The Wall?

Make a hole in your outside wall using a B-vent pipe. The exterior of the B-vent pipe is insulated to prevent flammable objects from penetrating. It is important since the venting for garage heaters can grow quite hot. A fire could happen if you use a single-wall pipe to break through the external wall.

Will Insulating My Garage Keep It Warmer?

Insulation is the best method to keep the garage cool in summer and warm in winter. Installing space heaters in the winter can help control how warm. Installing portable fans in the summer can help determine how chilly it is there.


It’s pretty common to wonder whether the garage heater venting is vertical or horizontal.

Keeping your cars warm in the winter is really important. In order to keep your garage warm, you have to install a garage heater. 

Thanks for staying with us till the end. Hope we could help you make your decision.

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