Would it be a bad idea to use two air filters?


There are plenty of pins on Pinterest that suggest covering the floor or the racks of your oven with aluminum foil to keep them clean.

While, on the surface, this may seem like a good idea, here are some reasons why you should keep foil out of your oven:

Putting foil on the bottom of a gas oven can interfere with the flame, leading to improperly cooked food or a damaged stove.Foil on the racks of gas or electric ovens can block heat and air flow, leading to improperly cooked food.With any type of oven, putting foil at the bottom can be risky. The foil may not be able to withstand the high heat and can melt to the oven, damaging it permanently.The heat reflected off the foil can make your baked goods cook faster.The heat reflected off of the foil may also burn out the oven's heating elements.You may not even want to use foil on your baking pans. This article explains why and some good alternatives.

Easy alternatives to protect your oven

While foil may not be a...

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Apparently, I haven't written a single article this summer about oversized air conditioners. Shame on me! I've written several in previous summers, mostly about how HVAC contractors bypass the HVAC design process by using rules of thumb and how they mess up the Manual J load calculations when they do go the preferred route. I've never written an article focusing on the reasons to size an air conditioner properly, though, so here it is.

Reason #1 - Comfort

When an air conditioner runs, it does two jobs. It lowers the temperature of the air, and it removes moisture from the air. To do the second one, the AC has to run for a while.

As the air passes over the evaporator coil, it encounters a very cold surface. Ideally, when the air passes over that cold surface, the air temperature drops about 20° F. In places where we have higher relative humidity in the summer, the other important process that happens when the air hits the coil is that the temperature of the...

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Is it a bad idea to check a bag on an airplane with a small form factor (SFF) computer in it?

My parents live on one coast and I dorm on the other. I would like to be able to bring my PC back and forth. I wanted to buy something like a Shuttle (except more do it yourself, I can put in my own motherboard and processor) and build my own SFF to bring back and forth. Yes, I know there is such a thing as a laptop and I happen to have one. In my experience though, everything goes slower on them. It burns DVDs slower, it processes slower etc. and they usually have smaller hard drives. I usually end up using my parents computer when I am home b/c I can't stand using my laptop. My laptop isn't even old. It has been slower than my desktop since the day I bought it. (I know this may have been unnecessay information but I am trying to quell the inevitable response, "Why don't you just get a laptop?") So my question is: Is it a bad idea to travel with a small form factor PC in my...

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What is biochar?

Biochar is charcoal created from plant matter.

It’s a great option as a sustainable nutrient-stabilizing practice, but can cause problems when used out of context in hydroponics or aquaponics.

Here's why: biochar retains nitrogen.

Biochar retains nitrogen

Biochar possesses many beneficial traits which can contribute a lot to sustainable, earth-healthy practices.

Unfortunately, the same thing that makes biochar a benefit to various agricultural and environmental methods is a death sentence for hydroponic and aquaponic systems.

That trait is nitrogen retention.

In ecosystems that experience rapid or “flash” movement of nutrients (like parts of the Amazon, which is where the use of biochar originated), biochar can be mixed with soil to capture some of those nutrients as they move through the soil.

In that form, the nutrients - namely, nitrogen - are released and available to plants in the long...

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Dear Tom and Ray:

On a recent cross-country trip (South Carolina to Nevada) with my boyfriend, we had an air-conditioning issue, which I'm hoping you can help us with. I wanted to make a cell-phone call, so I put the windows up (for quiet) and turned the AC on. We were cruising at approximately 80 mph. At the next stop for gas, the car was making a funny noise, which said boyfriend decided was the compressor. Then the AC did not work any longer. Plus, the car was smoking. So he took it in for service the next day -- and $1,000 later, we have another compressor, among other AC parts. The man at the repair center said you should NEVER turn your AC on going faster than 50 mph. Everyone I've talked to says they've never heard of such a thing, and they've all done it. And I have done it myself, with no repercussions. So is the repairman right? Is this true? We were driving a 1998 Jeep Wagoneer. It has had AC problems anyway -- could it have been an existing problem? Or did my...

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I have three return air vents in my ranch house (1500 sq/ft 3bdr) and noticed that they're a bit dusty. Is it a good idea to put filters on them to help purify the air in my home? If so, what kind of filters do you recommend? What rating/spec should I use so that it doesn't strain my HVAC.


Bad idea.

I have two return air vents that I put filters in. Since the air is getting filtered twice I usually buy the cheaper $2 filters. It doesn't seem to make a difference in the airflow with or without them.

In all of my new homes (builder) my HVAC guy puts the filters in the cold air return instead of the furnace because it is easier to access and therefore it is more likely that the buyers will change their filters.
Just use the same type as you have been using all along.

Probably no standard answer...... ...
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Is It A Good Idea To Microwave This? is an improvised experimentation-based comedy web series that has aired on the JPizzle1122 channel since 2007. Through 2010, the show was posted twice a week every Monday and Friday, before moving to a Monday / Wednesday schedule for the show's final two seasons. After a voluntary "retirement", the show now only exists in occasional, unschedled bonus episodes that are uploaded a few times a year. It was inspired by similarly themed popular programs like "Will It Blend?" and "MythBusters".

In the early seasons, the definition of "good idea" and "bad idea" were based on whether or not it was safe and productive to microwave the item, but as the show progressed, the definition slowly changed to whether or not the microwaved item put on a good show or not and/or the potential sentimental value of the item being microwaved, with miscellaneous third categories, like "stupid, or "boring" appearing infrequently as well that replaced the initial...

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Imagine hopping into a ride-share car, glancing at your smartphone, and telling the driver that the car's left front tire needs air, its air filter should be replaced next week, and its engine needs two new spark plugs.

Within the next year or two, people may be able to get that kind of diagnostic information in just a few minutes, in their own cars or any car they happen to be in. They wouldn't need to know anything about the car's history or to connect to it in any way; the information would be derived from analyzing the car's sounds and vibrations, as measured by the phone's microphone and accelerometers.

The MIT research behind this idea has been reported in a series of papers, most recently in the November issue of the journal Engineering Applications of Artificial Intelligence. The new paper's co-authors include research scientist Joshua Siegel PhD '16; Sanjay Sarma, the Fred Fort Flowers and Daniel Fort Flowers Professor of Mechanical Engineering and vice...

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I'm not a huge fan of The Daily WTF for reasons I've previously outlined. There is, however, the occasional gem – such as this one posted by ezrec:

Browsing through a web archive of some old computer club conversations, I ran across this sentence:

"Apple made the clbuttic mistake of forcing out their visionary - I mean, look at what NeXT has been up to!"

Hmm. "clbuttic".

Google "clbuttic" - thousands of hits!

There's a someone who call his car 'clbuttic'.

There are "Clbuttic Steam Engine" message boards.

Webster's dictionary - no help.

Hmm. What can this be?

As programmers, this isn't much of a mystery to us; it seems every day a brand new software developer is born and immediately begins repeating all the same mistakes we made years ago. I can't resist linking to Language Log again on this topic, where a commenter disputes whether or not this is an actual real world problem:

The "clbuttics" story may be a...

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By Tuan C. Nguyen By Tuan C. Nguyen

The air umbrella is a novel idea, but blasting away raindrops with air is going overboard. (Chuan Wang)

Umbrellas have been around seemingly forever. But if there were ever to be a second coming, it wouldn’t be a stretch to assume it would resemble the air umbrella.

Conceived in the form of a sleek wand, the device is both minimalist and high-tech. Push a button and a stream of jet air flows out from the motorized tip, generating an invisible barrier against the rain. It’s almost too perfect.

Of course, then, we have the big question of whether an actual product will ever materialize.

For now, specifics are spare. The inventor’s fundraising campaign site on Kickstarter features a promotional video that, using a series of graphics-rendered mock-ups, details various models currently under development. Backers can choose from a compact women’s version, which measures a foot long, weighs just over a pound and is...

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Oxygen sensors eventually need to be replaced in all vehicles. If your vehicle’s O2 sensor is faulty, chances are there will be signs! Check this list to see if it’s time to replace YOUR vehicle’s oxygen sensors:

Sudden decrease in fuel mileage. A defective O2 sensor will likely cause your air-fuel mixture to be too rich and directly affect your fuel economy. Flashing check engine light or malfunction indicator lamp in the vehicle?s dash board. Of course this can happen for other reasons as well (and a defective oxygen sensor is one of them!) Failure to pass smog. According to the EPA (Environmental Protection Agency) and CARP (California Air Resource Board) 50 to 60% of all smog test / emission test related failures are attributed to defective oxygen sensors, causing either low or high CO emissions. Overall poor vehicle performance; rough idling, stalling, hesitation on acceleration, etc. And the most accurate diagnosis is achieved using an OBDII code checker. All cars...
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Do you buy air filters for your house? What am I saying… of course you do. Just about everyone does.

Are you over paying for air filters?

You probably are. I did. For 7 years I overpaid.

Then last year I discovered that if I buy them here online in bulk it's much cheaper. And this year when I went to do some research for this article I discovered that some companies within the air filter industry are trying to pull a fast one on YOU!

Look - I'm not a conspiracy nut or something like that. I'm just a Dad who has a family to support and a house to keep up. I take out the trash and I change the filters - these are some of my best contributions to the house. That… and my insane knowledge of how to hook up electronics.

I know this is my basement finishing website but I thought you guys would appreciate hearing my story and getting less expensive filters (of the same quality).

First, let's start with why I'm angry at Home Depot.

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By Carl Strohmeyer-PAMR 35+ years experience
Updated 3/12/18


The purpose of this article is to help the reader choose the right filter or filters for their aquarium filtering needs and also help with troubleshooting of existing filters (or even bring back to life a "dead" filter as in the case of canister filters with failed motors).
A lot of this article is simply subjective based on my experience, however the troubleshooting sections are much more objective and useful regardless of whether one agrees with my reviews and experience.

There are several different types of aquarium filters, each aquarium filter with advantages and disadvantages.
I have found over the years that most filters work best when used in combination to compliment each other, this redundancy is also important for peace of mind in case one filter fails, another will keep your aquarium filtering.

I would also like to point out that I am a big...

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Water filtration systems have skyrocketed in popularity in the last twenty years, especially as there is a push to “Go Green” in our society. Since its humble beginnings in Germany in 1966, Brita has been a leader in the water purification business. Born under a pear tree, the business was started by Heinz Hankammer, who named it after his daughter Brita.

Today, based out of Oakland, California, Brita is firmly the number 1 brand in water filtration systems.

Since 1986, PUR has been another leading water purification company. It started out trying to turn seawater into drinking water, and began producing water filtration systems in 1994. They have consistently produced filters that perform well and create clean water.

Having been in the business for 15 years and selling over 9 million products, Aquasana is yet another company that has had success in the water filtration market. They rival Brita as one of the top companies in America.

Each of...

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