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Low grain refrigerant (LGR) dehumidifiers are critical to produce and sustain optimal low humidity conditions for professional drying projects.

Many dehumidifiers claim to be “LGR,” but not many can reduce the environment to very low grain conditions. And their claim of “LGR” is not often checked thoroughly in low-humidity test chamber atmospheres such as 80°F/20% RH or 70°F/30% RH – the very lowest GPP (grains of moisture per pound of dry air) possible on drying projects using LGR dehumidifiers.

To ensure that Dri-Eaz® dehumidifiers achieve peak results in low grain environments while maintaining effectiveness at high humidity, Legend Brands engineers conduct controlled testing at 15-20 environmental conditions for up to 1500 hours, then finetune a dehumidifier model’s controls to optimize water removal. This delivers superior performance versus competitive models across the full drying range.

• Real-time environmental monitoring to adjust the dehumidifier’s operation dynamically.
• Prioritizing maximum water removal in all conditions including low grain and maintaining lowest humidity output for faster and deeper drying of wet structural materials.
• Minimizing electrical amp draw during drying operations.

Besides using this AHAM spec to tally how many dehumidifier PPD are needed to start a job, dehumidifiers’ AHAM PPD capacity also has relevance for water damage job revenue. Xactimate® estimating software publishes four different refrigerant dehumidifier capacity ranges with corresponding lowest to highest daily rental rates, commonly used in insurance billing.

That’s why restoration-focused manufacturers list the standardized “PPD Water Removal at AHAM (80°F/60%RH for 24 hours)” in their specs. Besides AHAM, manufacturers often also list an “up to” or “Max. Water Removal” PPD capacity, which is 90°F/90%RH for 24 hours – a dehumidifier’s highest capacity. This “Max” specification is not useful in the restoration industry; however, other industries utilize it.

The real proof of any dehumidifier’s performance is “water in the bucket” – the actual water removed – throughout the duration of the job. That’s why it’s critical to achieve maximized water removal across the full range – from initial highest humidity levels to drier, low grain conditions – to most efficiently draw out deep moisture from the most difficult, densest materials.