You can use fiberglass insulation, right up to the duct. The heated air inside the duct isn't hot enough to burn the insulation (if it was, then double-walled dryer ducts would be required).
Most folks use clamps or metal foil tape. Metal foil tape is good at handling the heat that your dryer will produce. Connect the elbow joint if necessary to navigate any turns or go upward. Run the metal duct pipe from your dryer to the hole you've created. Avoid kinks and tight turns which can trap lint.
Foil tape is known for its excellent insulation properties. Since it is made of aluminum, it prevents heat or cold air from escaping a system, which makes it an excellent accessory for both duct cleaning and dryer vent cleaning.
Galvanized steel is the strongest and best choice. Not always the easiest to find. Typically you'll find aluminum ducting which will also work. You can buy a 5' piece and a 2' piece. Cut to length before snapping together and then use foil tape to seal.
The flexible nature and expandable configuration allow most installs to occur without any modification to the duct or the wall penetration. A pair of jumbo zip ties and you're good to go…at least for a few months until all of the internal bumps and ridges begin to clog with lint.
Foil duct is held in place with dryer clamps or large hose clamps. Metal tape can also be used to secure the flexible aluminum duct, too, but clamps make it easier to remove the tubing for cleaning.
Cover your dryer vent hole with 1⁄4 in (0.64 cm) hardware cloth. Hardware cloth is a type of sturdy, galvanized wire mesh and 1⁄4 in (0.64 cm) hardware cloth means that it has 1⁄4 in (0.64 cm) openings in the mesh. These spaces are small enough that even tiny critters like mice won't be able to get through the cover.
Joints should be secured with metal tape (not duct tape). Do not use rivets or screws in the joints or anywhere else in the duct as these will encourage lint collection. Length of concealed rigid metal ducting shall not exceed 35 feet (25' for IRC).
Secure Vent Hose with Clamps
If your vent hose repeatedly disconnects, it's likely due to loose vent clamps. Use clamps to tightly secure the vent hose to both the dryer and the vent opening. Ensure a snug fit to minimize the chances of the hose coming off.
A: The tape is flammable and burns very well so I would not recommend it.
Installation tip:
Foil tape is the only kind of tape meant to withstand the heat dryer venting emits during a cycle, so don't settle for alternatives like duct tape. Avoid using anything that would protrude into the venting, such as screws, to secure the hose as lint can snag on screws and build up over time.
Install insulation around dryer vents to prevent condensation and freeze-thaw issues. Vent covers or hoods can help protect against snow and ice blockages.
M1502.
Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces, with joints running in the direction of air flow. Exhaust ducts shall not be connected with sheet-metal screws or fastening means which extend into the duct.
Fire Safety: Dryer vent covers without functional dampers or made of flammable materials like plastic pose a significant fire hazard. Thousands of house fires each year are caused by lint buildup in dryer vents.
How to seal a dryer vent pipe: Medium to large gaps. For filling larger vent gaps, foam is the best choice. For extra-large gaps up to 3 inches in size, go with Loctite Tite Foam Big Gaps Insulating Foam Sealant. To achieve the best results, the foam should be applied in several layers, especially for vertical joints.
Keep Out Rain and Debris With a Dryer Vent Cover
A dryer vent cover is an easy-to-install item that helps to ensure your dryer operates optimally without interruption. You'll find a variety of exterior vent covers when you shop with us at Lowe's.
Rigid Metal Ducting: Rigid metal ducting, such as aluminum or galvanized steel, is widely considered the gold standard for dryer vent systems. These materials are non-combustible and can withstand high temperatures, reducing the risk of fires.
The exhaust duct should be rigid metal 4 inches in diameter and no more than 35 feet in length or as specified by the duct manufacturer. This length should be decreased by 2.5 feet for every 45-degree bend the duct makes and 5 feet for every 90-degree bend the duct makes.
Different materials used to manufacture zip ties have various temperature tolerance levels: Nylon 6.6: This is the most common material for zip ties. It generally has a temperature range of -40°F (-40°C) to 185°F (85°C). However, it can get brittle at lower temperatures.