Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: My dryer vent exhausts on our deck, leaving lint all over.  Does the Heartland Dryer Vent Closure allow the lint to blow out when dryer is running?
Document: Geez, a complainer in every crowd, I guess!My vent closure has eliminated cold air from entering the laundry room! Opening our dryer door used to feel like opening a freezer door. Our feet would turn to ice in that room until I installed this vent closure!! And the floating cup, despite lint build-up, has maintained a tight air, bug & rodent-proof seal when the dryer is not running.
I live in the mountains, a draft from the dryer vent made the laundry room and surrounding rooms unbearably cold in the winter. The Heartland closure did the trick. It seals the vent when not in use. Allows free flow out when the dryer is running. The vent is completly unrestricted which makes the dryer work effortlessly to dry like it should.
I first purchased the Heartland Dryer Vent Closure approx. 10 years ago for a previous home. It is still in use and was never painted. I am extremely happy with the performance and longevity of this product so I purchased another for this home. I do not expect to be disappointed. I would highly recommend this driver vent. The operation is smooth. It lifts (floats) to allow the dryer to exhaust the moist air and then closes to stop infiltration of air, bugs or rodents.
Update 2/12/14. After 1 yr+ operation, I have to give the Heartland 21000 dryer vent closure a 5 star rating. It performs without all the problems that the flapper-type vent closures typically have--getting stuck open by lint, or by rusting of the springs. When the dryer is not operating, the Heartland closes tight & keeps out fumes from lawn movers, etc. In 1+ yr of operation, it has never stuck open & never gotten clogged by lint.
We were having problems with mice getting into our old flapper style dryer vent. We weren't even aware they were coming in there until we bought a new high-efficiency clothes dryer that is sealed and doesn't allow mice to escape if they do get in the vent. Two dead mice in the dryer in a year prompted a look for a critter proof vent. This one does the trick! It also vents well and keeps the cold air out when the dryer's not running! A winner! Highly recommend !
My husband installed this vent closure with no problems, thanks to the reading helpful hints from prior product reviewers.We purchased this for our dryer vent that is located in the garage. We had an issue with a really stupid existing vent pipe installed by prior home owner, who vented the hose through the garage wall and down through our front (deck) walkway.
Excellent for blocking very cold air (-12) outside from coming through the dryer vent. Easy to install. Works fine when the dryer is on no clogging up from lint. Little rodents cannot get into this vent closure. Be sure to caulk around the outer edge when installing.
I was a bit concerned about lint gathering at our front door. If I clean the lint trap in our dryer as I should, I have zero issues, and zero mice!My 5 fairly large potted cacti camouflage the vent closure, as it's not the most beautiful thing to be looking at when walking up to the front door.
The only thing I don't like is that the outlet will allow insects inside. This would be a really great place for a hornet or wasp nest, so if you do buy one of these, you will have to put a mesh screen around the bottom that can be removed to clean any lint buildup.Other than that, this was very very easy to install.
Our dryer stopped working. Turns out birds had nested in our dryer vent, completely obstructing it. We are lucky we didn't have a house fire. Directions are clear, very easy to install. Extending the vent tubing inside the closure as described is an excellent idea and aids both fit and seal. Vents lint without clogging. I had one of the mesh covers and it clogged almost weekly - the plastic finally broke. I recently read that the mesh sort of cover is unsafe for this very reason.
Answer: yes