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AIRx Bargain Filters 20x20x1 Air Filter MERV AC 11 Furnace Pleated Brand new HVAC

AIRx Filters 20x20x1 Air Filter MERV 11 Pleated HVAC AC Furnace


AIRx Filters 20x20x1 Air Filter MERV 11 Pleated HVAC AC Furnace


Product Description


Nominal Dimension 20x20x1 in
Actual Dimension 19.50 x 19.50 x 0.75 in
Model / MERV Rating Allergy / MERV 11
Pack Size 11-Pack
Allergy Air FlowAllergy Air Flow

Why is MERV Rating Important?

MERV stands for Minimum Efficiency Reporting Value and is an industry standard to rate a filters efficacy. We recognize this is not very easy to understand for consumers, so we developed our simple to use application naming system. Simply pick the filter that suits your needs.

Allergies, pets, odors and smoking all can greatly affect the quality of your indoor air. Discount Filters offers many different types of air filters to help you breathe easier and choose the correct filter based on your specific needs.

Right Air FilterRight Air Filter
Generic vs AIRX FILTERS AllergyGeneric vs AIRX FILTERS Allergy

AIRx Filters 20x20x1 Air Filter MERV 11 Pleated HVAC AC Furnace

General Geology
Geologic Hazards
Oil and Gas
Plate Tectonics
Satellite Images
Teacher Resources
U.S. Maps
World Maps
World Records

Canary Islands

Where Are the Canary Islands? Off the northwest coast of Africa, 60 miles west of Morocco.
Bear Attacks

Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.

Zircon is the primary ore of zirconium and a gemstone that is available in many colors.
Mineral Luster

What Is Luster? Luster is the light-reflecting characteristics of a mineral specimen.

Sand is a diverse material. This gallery includes photos of sand from around the world.
Crystal Habit

Crystal Habit is the external shape displayed by a crystal or an aggregate of crystals.
Mineral Hardness

Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Hardness Picks

Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.

Coquina - A porous limestone composed almost entirely of fossil debris.
Largest Hurricanes

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Mount Etna

Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Volcanic Explosivity

Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
The Acid Test

The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Record Lightning

World Record Lightning - this lake has more lightning than any other place in the world.
Blue Flames

Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Rock and Mineral Kits

Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
Ruby and Sapphire

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.

Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Teacher Resources

Teacher Resources - K-12 resources for teaching about earth science.
Types of Maps

Types of Maps - Explore some of the most popular types of maps that have been made.
Largest Earthquake

Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
Tallest Tsunami

Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
E.T. Volcanoes

Solar System Volcanoes - Earth is not the only location of volcanic activity.
Rock Tumblers

Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Mars Meteorites

Mars Meteorites Mars rovers have found dozens of meteorites while exploring the red planet.
Utica Shale

Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.

Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
San Andreas Fault

What is the San Andreas Fault? Map, photos and description of the fault.

Pictures of Opal - A collection of different types of opal from all around the world and Mars too!

Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Fool*s Gold

Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
US Diamond Mines

US Diamond Mines - Did you know that diamonds have been mined in the United States?
Geology Tools

Geology Tools Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Watch out for Ticks!

Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
American Gemstones

Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
Aritone Womens T Shirts Loose Fit Fashion Women Summer Print Cre
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Earthquake Maps

California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.

Charoite is a purple silicate mineral, found only in Russia, used as a gem material.

Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.

Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Underwater Volcano

Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
Fireworks & Minerals

The Science of Fireworks Learn how the colors and shapes are created.
Copper vs COVID-19

Copper Kills COVID-19 and many other pathogens to limit the spread of disease.

Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Greatest Ocean Depth
Tow Ready 20136 4-Flat to 5-Flat Connector Assembly, Black
Deepest Point in the Ocean The deepest point in the ocean is in the Mariana Trench.
Google Earth - Free

Free Google Earth software allows you to browse seamless world satellite images. Free.

Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Bear Map

Range of Bear Species - Where you might encounter different types of bears.
Uses of Gold

The Many Uses of Gold - Unique properties make gold one of the most useful metals.

Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
Methane Hydrate

Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
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Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Colored Diamonds

Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.
Hurricane Names

How Are Hurricanes Named? There is a plan for naming tropical storms.
June 6th 1912

Novarupta - The most powerful volcanic eruption of the 20th century occurred in the U.S.A.

Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
The Brewery Rock ?

The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.

Geodes look like ordinary rocks on the outside but can be spectacular inside!
Wall Maps

Wall Maps - Wall maps of the world, continents, states and the USA.

Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
What is Geology?

What is Geology? The study of Earth materials, structures, processes and life over time.

Shale - The rock that has quickly transformed the oil and gas industry.

Granite - The intrusive igneous rock that underlies continents and countertops.
What Is Earth Science?

What Is Earth Science? The study of Earth and its neighbors in space. Learn more!

Diamond Misconception - Many people think that diamonds form from coal. Not True!
Ethiopian Opal

Ethiopian Opal - The new opal heavyweight that might give Australia a run.
Geology Books

Geology Books - A variety of books for reference, field trips, reading and more.
Great Rift Valley

The East Africa Rift System - The extensive fault system that is tearing Africa apart.
UV Mineral Lamp

Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.
Plate Tectonics

Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
What Is The Moho?

What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
Gold Pans

Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for Gold.
Rock Art

Rock Art - People have been marking on rocks for thousands of years.
Ant Hill Garnets

Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!

Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.

Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Expansive Soil

Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Sliding Rocks

Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Petrified Wood

Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.
Lapis Lazuli

Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Types Of Eruptions

Types of Volcanic Eruptions - A description of the most common eruption types.
Grape Agate

Charger for Gameboy Advance SP , AC Power Adapter Charging Cable is a popular mineral specimen with the color and the shape of a bunch of grapes.

Gemstones - Colorful images and articles about diamonds and colored stones.

Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Hand Lens

Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.

Meteorites - Rocks that were once parts of planets or large asteroids.
Crater of Diamonds

Crater of Diamonds - The only diamond mine in the world where you can be the miner.

Citrine is the transparent variety of quartz with a yellow to orange to reddish color.
Waterproof Paper

Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Tallest Mountain

Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Gem Silica

Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Field Courses

Field Courses - Over 80 field courses for undergraduate geology students.
Lightning Strikes Map

Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.

Emerald is the most popular green gemstone in the United States and most of the world.
Rock Salt

Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
What is a Geyser?

What is a Geyser? Photos and information about geysers in many parts of the world.

Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Herkimer Diamonds

Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.

Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Cave of the Hands

Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.

Turquoise - A bluish-green gem material that has been used for over 6000 years.

Tourmaline - an extremely colorful mineral and gem material.
Fluorescent Minerals

Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Largest Diamonds

World*s Largest Diamonds Records for the largest rough, faceted and carbonado diamond.
Rare Earth Elements

Rare Earths - Special materials used in electronics, defense, medical & many other products.

Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Don*t Go To Jail

Know the Rules before removing rocks, fossils or minerals from public or private property.
Fire Opal

Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Homeowners Insurance

Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Largest Volcanoes

Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Horizontal Drilling

Horizontal Drilling has opened new resources and significantly improved productivity.

Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Cinder Cones

Cinder Cones are the smallest, simplest, and most common type of volcano.
ChicSilver 925 Sterling Silver Triple Interlocked Rolling Ring H
YoYoFactory F.A.S.T 201 Yo-Yo - Adjustable YoYo - Great for Begi was unknown until a few decades ago but it has erupted into wide popularity.
Mineral Rights

Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Tallest Waterfall

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.

10 Gemmy Facts About Spinel - Is spinel the world*s most overlooked gem?
Coal Close Up

Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
100+ Gemstones

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Debris Flows

Debris Flows are moving masses of loose mud, sand, soil, rock and water.

Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.

Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
The British Isles

Names Used for Great Britain, British Isles, United Kingdom, and Ireland. What they mean.

Chalcopyrite - The most important ore of copper for over five thousand years.
Uses of Marble

The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
DeLorme Atlas

Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
Gifts That Rock

Gifts That Rock - What are the most popular gift items in the Geology.com store?
Gems from Space

Extraterrestrial Gems - A number of materials from space are used as attractive gems.
What is a Maar?

What is a Maar? The second most common volcanic landscape feature on Earth.
Storm Surge

Storm Surge can be the most damaging and deadly aspect of a hurricane.
Hawaiian Hot Spot

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Uses of Talc

Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Crushed Stone

The Unsung Mineral Hero - and the commodity upon which almost everything is built.
Pyroxene Minerals

Pyroxene Minerals are a group of chain silicate minerals found in igneous and metamorphic rocks.
Mount Vesuvius

Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Rocks on Mars

Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.