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LGR Dehumidifiers - Professionals' Choice

The low-grain refrigerant dehumidifier (LGR) is the choice of all kinds of crisis-restoration professionals, since it has the greatest capacity and efficiency at the most reasonable cost when considering options for water, moisture and vapor removal.

When to use an LGR Dehumidifier

An LGR dehumidifier is a commercial-industrial-grade machine built to address the heavy-duty water and moisture removal situations that result from a big storm, a burst pipe or plumbing flood, construction, a fire, water main or sewer problems and other situations. Successful in-place drying requires a mix of the right assessment, restoration equipment, knowledge, experience and calculations.

Carpet cleaners, restoration specialists, flood-damage professionals and others realize how important it is to have equipment that is cost effective and efficient.

Anyone tasked with managing the moisture resulting from emergencies knows the mission to remove water vapor is important for a number of reasons:

  1. Maintain structural integrity of the building
  2. Discourage corrosion of metal parts
  3. Preserve furnishings, carpet, window treatments and another decor
  4. Avoid harmful mold or bacteria
  5. Prevent foul odors
  6. Fight moisture regain
  7. Fend off retention
  8. Combat condensation

You have to know the finer points and technical aspects of water, moisture and vapor behavior to know how to counteract and extract it. Any contractor or restoration business owner tasked with handling such an issue must remove the water as quickly as possible in order to prevent worse damage and make property restoration more probable.

Classifying LGR dehumidifiers

The U.S. Department of Homeland Security addressed claims guidance on structural drying and related topics in a 2013 memo. It states that “evaporating water within salvageable building material can be best accomplished by increasing the vapor pressure differential, which is the force created between the moisture in the affected material compared to the amount of water vapor removed in the affected air.

“When the outdoor environment or the building’s HVAC system is insufficient for drying, the most effective means to increase vapor pressure differential is with low-grain refrigerant (LGR) or desiccant type dehumidifiers, which are capable of removing a significant amount of moisture from the affected air.”

That memo also classifies standard refrigerant dehumidifiers as condensing 70 pints per day (PPD), large at 130 PPD and extra large at 170 PPD. Professionals calculate their own square footage, ceiling height, a degree of saturation, air temperature, relative humidity (RH) and other factors to determine how much dehumidification is needed. That knowledge leads to decisions about which machines to use and for how long.

LGR dehumidifiers have an internal condensate pump, long hose and (like its more-expensive desiccant-type counterpart) are ductable for maximum efficiency when eliminating moisture from an enclosed place.

Industrial power is what you need to (figuratively) reach into the walls, carpets and floors of a building to extract the bothersome and damaging moisture. LGR dehumidifiers have gradually replaced traditional technology and become the choice equipment of water damage cleanup and flood remediation specialists. The machines and their technology have become increasingly more efficient and sophisticated.

Beyond crisis response, an LGR dehumidifier can also maintain a certain level of humidity in different types of environments. These large dehumidifiers use an enhanced process that amounts to a double step of cooling. This lowers the temperature of the moisture-rich air faster, so condensation happens at a faster rate.


LGR Dehumidifier Basics Defined

Low-grain-refrigerant dehumidifiers contain an enhanced refrigeration system that can dry a space to lower humidity than conventional-refrigerant dehumidifiers. They pre-cool the incoming air stream with a heat exchanger or heat-pipe technology, which removes more water per kilowatt of electricity than its conventional-dehumidifier counterparts. LGRs extract greater amounts of water and continue to dry air to a lower humidity more effectively than traditional dehumidifiers.

When you look at commercial-grade dehumidifiers, the majority operate via a compressor charged with refrigerant, as in an LGR dehumidifier and the technology explored here. There are options for desiccant dehumidifiers that use a drying agent, but they can cost double, triple or more than compressor/refrigerant-based technology.

LGR water removal metrics

A low-grain dehumidifier is a drying unit that features a double-cooling action. It moves air over a cold surface and a cooling device, then forces the water vapor to condense at a greater degree of efficiency compared to a standard dehumidifier. An LGR dehumidifier removes water below 55 or even 40 grains per pound.

Grains is the unit used to measure the amount of water per pound of dry air. One grain is equal to one drop of water. Knowledge of the humidity levels enables you to figure out proper settings for the dehumidifier to manage different situations.

Dehumidifier capacity is expressed in terms of relative humidity (RH). The industry assumes normal operating conditions of 80°F and 60% RH. Saturation operating conditions are recognized as 90°F and 90% RH. These are the standards manufacturers use, as well as the Association of Home Appliance Manufacturers (AHAM), the body that tests dehumidifiers to make sure they remove the amount of water their producers say they do.

Still, the pints or gallons given with a machine’s specifications may vary with conditions if a user operates above or below the standard. For example, if you select a 100-pint-per-day machine and your temperatures and humidity are higher or lower than the 80/60 and 90/90 standards, your capacity will likely differ along with them. This is also the reason you might see varying capacity among LGR dehumidifiers, such as 75-99 pints per day (PPd).

The fan inside a dehumidifier pulls the humid air in and pushes out the exhaust, and its power is expressed as the cubic feet per minute (CFM). Commercial industrial-grade dehumidifiers typically have a high CFM range compared to consumer-grade dehumidifiers. The higher-CFM fan processes more air and can pull it in from farther distances to cover more square footage.

LGR dehumidifiers remove water

The LGR dehumidifier has revolutionized the disaster-response, cleaning and restoration industries, because it does a job that little other equipment can: It extracts water up and out, such as from the notoriously hard-to-dry carpet pads. In short, the LGRs have a greater capacity to remove water vapor from the air, carpet, carpet pads, walls, wood and other materials within a structure.

Besides their technological ability, restoration LGR dehumidifiers enable great versatility and easy portability. Some models are ductable to help contractors be more mobile and flexible as they move around their workspaces.

LGR humidifiers are uniquely suited for water damage, flood, or disaster-restoration projects, and Aer Industries offers the expertise of long experience with dehumidifiers as well as a top-quality line of commercial industrial-grade LGR dehumidifiers for sale.


B-Air® Vantage LGR VG-3000 Dehumidifier

An ultimate and favorite among industrial dehumidifiers, the B-Air® Vantage LGR 2200 offers power and capacity along with intelligent design and easy-to-use controls to remove more water than other commercial-grade models. This powerful LGR machine will adjust itself for efficient operation in temperatures from 33 degrees F to 125 degrees F.

LGR B-Air Vantage 3000

Its specifications tell a lot of its story:

  • Dehumidifying capacity — AHAM = 170 PPD, saturation = 38 gallons/day (300 PPD)
  • Power supply — 115 volts, 60 hertz, 12 amps
  • Size — 40 x 21 x 25
  • Weight — 195 pounds packaged and 160 pounds standing

Its coated, aluminum-core heat-pump technology enables it to defrost when necessary while continuing to output water. This high-powered dehumidifier includes options for exhaust and intake ducts and uses a standard MERV-8 filter and R410 low-grain refrigerant.

The B-Air® Vantage LGR VG-3000 maneuvers easily and stands sure with recessed wheels and non-slip-rubber feet. A convenient 30-foot drain hose and 25-foot power cord reach the nearest outlets in commercial buildings, which can reduce or eliminate the need to tote around extension cords or extra drainage receptacles.

It carries many features that contractors and other users find to be an advantage:

  • Internal condensate pump automatically empties reservoir when it’s full
  • Drain hose good to an elevation of 20 feet without a supplemental pump
  • Purge button can be used even when dehumidifier turned off
  • Hour counter displays to the 1/10th of an hour
  • Machine senses when it needs to clear the evaporator coil and will automatically enter and exit defrost mode as needed, displaying a warning light in the process
  • Both vents on the dehumidifier can be vented or ducted with 10-inch-diameter round ductwork and included duct rings
  • Equipped with a MERV 8 dust filter
  • Drain hose stores under the top cover
  • Cord either wraps on the side of the unit or can be stored in the top

Some general usage tips of the LGR VG Vantage 3000 include not operating it with a dirty filter because it will inhibit efficiency. Operating a dehumidifier with no filter is also inadvisable because that will gum up the inside of your machine with mold and bacteria, which somewhat defeats the purpose of a dehumidifier plus will shorten the machine’s lifespan considerably.

The plug has a built-in safety ground, so if you do use an extension cord, it’s important that it has the proper rating of at least 12 American Wire Gauge (AWG) conductors if it’s less than 25 feet long and a minimum of 10 AWG conductors if it is more than 25 feet.

Transport the machine upright if possible. If you cannot, allow it to sit upright for 30 minutes before turning it on, so that the refrigerant and oils have a chance to settle back into position. Purge any water and then use the machine. It is also important to change the filter as recommended or needed.

The 3000 carries a one-year warranty on parts and labor overall and a five-year warranty on parts and labor of the sealed system, which includes the compressor, evaporator and condenser.


BlueDri™ BD-LGR75C Dehumidifier

The BlueDri™ BD-LGR75C Dehumidifier ranks as an indispensable workhorse for any water-damage restoration and construction projects. It removes about 15% more water than comparable models and has many features and design facets that appeal to industrial and commercial users. For whatever kind of flooding or water-damage event affects operation, the BD-LGR75C can help.

BlueDri LGR dehumidifier removes 15% more water

  • Dehumidifying capacity — AHAM = 75 pints/day, saturation = 145 pints/day
  • Power supply — 115 volts, 60 hertz, 625 watts, 5.5 amps
  • Size — packaged = 23 x 19 x 29, and unit standing = 20 x 18 x 28
  • Weight — 90 pounds packaged and 84 pounds net


BlueDri™ BD-LGR75C Dehumidifier has a compact design and fold-over handle that enables it to fit into any commercial or industrial application, as well as into the vehicles that transport equipment to job sites. This machine operates at temperatures from 33°F to 100°F.

Most busy contractors and workers like this dehumidifier’s automatic water pump, digital display, auto restart, electrical controls, hour counter and temperature sensors. The three-wire power cord reaches 25 feet, and the LGR75C is available in blue, green and red.

Benefits of the BlueDri BD-LGR75C dehumidifier

It uses R410 low-grain refrigerant, and the parts carry a one-year warranty, while the molded polyethylene housing has a five-year warranty.

Its mechanical ability alone is impressive, but the BlueDri™ BD-LGR75C Dehumidifier comes with many thoughtfully designed features that make it easy for busy contractors to tote, use and store. The touchpad control panel built into the top of the dehumidifier allows for easy viewing and use. A function key takes you to the setting choices for humidity, ambient humidity, total running hours and ambient temperature.

A “regulate” button helps you to adjust humidity, which goes in increments of 5%, as well as set total hours or job hours and pick Fahrenheit or Centigrade for temperature.

The panel includes intuitive controls for defrosting, fan and other functions, and the overall machine includes many beneficial features.

  • These dehumidifiers can stack atop one another, if need be, for efficient storage or transport
  • The filter sits at the front of the machine where it is easy to access and quick to change
  • A durable, made-of-metal grill protects the air-intake area and filter so it stands up to the accidental bumps and dings of commercial work
  • A look at the bottom front of this dehumidifier supplies convenient storage for the water pipe and female connector so that vital piece is easy to locate when needed
  • The dehumidifier accommodates 0.558-foot-diameter ductwork to satisfy a broad list of need
  • A back-mounted, metal pull rod enables easy transport long-lasting durability
  • A broad-diameter air outlet in the back enables effective exhaust
  • Fixed support in the back of the machine stores the long power cord neatly when it’s not in use and helps take up the slack when necessary
  • Located in the back of the machine, the drainage hose is easy to access and store
  • The pump automatically purges water when the reservoir is full and automatically shuts off after 40 seconds of continuous operation.

Some general usage tips for the BlueDri™ BD-LGR75C dehumidifier are to limit ductwork to 16.5 feet to prevent it from winding. If new or ever on its side, give the dehumidifier 30 minutes to sit upright before turning it on so that the coolant and other fluids have ample time to stabilize.

Press the “purge” button to expel water before moving the machine in order to avoid sloshing and spills. Also, turn the machine off before tilting or moving it. Another important point of maintenance is to change the filter as often as needed.

Position it in the center of a room so that no walls, furniture or other objects block the vents. In order to preserve your dehumidifier’s pump, avoid elevating it more than 10 feet above the drain.


Who Else Uses LGR Dehumidifiers?

The people faced with removing water as part of their profession commonly include water-damage and flood-restoration companies, recovery specialists and disaster-response experts, but there are many entities that may need an industrial refrigerant dehumidifier.

  • Carpet cleaners
  • Construction companies
  • General contractors
  • Government entities such as states, counties, cities, towns
  • Churches
  • Property-management businesses
  • Realty companies
  • Hotels and other hospitality
  • Food service
  • Printing
  • Rental property owners
  • Agriculture

Dehumidification options point to LGR for many different industries and professions because it is the most effective way to extract harmful moisture, especially when compared to evaporation or air movement alone.


R410 Benefits Business and Environment

The low-grain refrigerant used in most dehumidifiers is the cousin of a new blend introduced to replace the old R22 coolant, which contained a type of fluorocarbon identified as harmful to the ozone layer. The development of R410 answered the environmental concerns and created greater efficiency since the new refrigerant operates at a significantly higher pressure than the older ones. It is a blend of HFC-32 and HFC-125.

Though it is also a hydrofluorocarbon and contains hydrogen, fluorine and carbon atoms, it lacks the chlorine that makes former refrigerants harmful. LGR dehumidifiers come equipped with the low-grain refrigerant that not only manages the big, tough water-removal jobs but also uses the latest, safest and most efficient technology.


Complementary Equipment

Besides helping to dry carpets and other water-flooded areas, plenty of automotive, construction and other establishments use air movers to help keep concrete floors dry. The air movers are tough yet lightweight and easy to carry.

Aer Industries offers air movers certified for safety, including restoration models with variable speeds and different blowing positions plus features to make work easier. The BlueDri™ air movers, for example, can work together, up to four at a time, or can be placed separately around the rooms.

We carry air scrubbers since air quality is often an issue for those who need to work in and around water- or fire-damaged job sites. Industrial-strength air scrubbers can filter the air to the HEPA level, and some use negative-air force to draw air in, then filter and release it.

Aer also offers industrial and wholesale packages that include all three components together, an LGR dehumidifier, an air mover and an air scrubber. We also offer some packs with different, multi-machine combinations. Whatever your restoration, flood-damage or large-scale water-removal needs may be, we provide the expertise and equipment to fulfill them.

Aer Industries offers industrial and wholesale equipment packages

Turn to the Experts, Dehumidification Professionals

Part of Aer Industries’ mission is to serve the water-damage and flood-restoration specialists, as well as professionals from other industries, with quality options for restoration equipment. Effective water removal can both salvage items and prevent the development of harmful materials. When you get ready to buy LGR dehumidifiers, Aer can provide top-quality options.

As master distributors of B-Air®, BlueDri™, and Soleaire® products, as well as purveyors of many other brands of dehumidifiers, air movers, scrubbers and other products and machines, we can help you make a property dry again.

Our values include a dedication to service and value our clients, which makes quality, safety and innovation top priorities. That entails providing a good warranty and making seasoned experts available to you for technical knowledge, parts and other support. Aer Industries provides a complete inventory of complementary products that help you finish water damage remediation jobs efficiently, as well as LGR dehumidifiers.

We can provide information, product support, warranty assistance, quick shipping and even finance options to help make sure you’re informed, equipped and ready to respond in your own business. Regardless of how something becomes flooded, you can consider Aer Industries as a partner to help you restore things back to pre-flood conditions.