IICRC Psychrometric Moisture Calculation

GPP (Grains Per Pound) & Grain Depression Calculator

Convert ambient jobsite temperature and relative humidity (RH) to Grains Per Pound (GPP), Dew Point, and evaluate LGR dehumidifier grain depression for daily drying logs.

1. Ambient / Affected Chamber Air

Dry Bulb Temperature (°F)

Relative Humidity (% RH)

Calculated Ambient GPP: 84.4 GPPDew Point: 62.4 °FVapor Press: 0.57 inHg

2. Dehumidifier Outflow / Exhaust Air (Grain Depression)

Exhaust Temp (°F)

Exhaust RH (% RH)

Calculated Exhaust GPP: 53.7 GPPDew Point: 50.1 °FGrain Depression: 30.7 Δ GPP

Drying Performance✓ Active Drying Progress

GPP

Ambient Specific Humidity

84.4 grains/lb

LGR Grain Depression (In vs Out)

30.7 GPP removed

Grain depression is above 15 GPP. Your LGR dehumidifier is actively pulling moisture from the air chamber compliant with IICRC S500 recommendations.

24/7 Mitigation Intake

Your dehumidifiers work 24/7. Does your emergency intake line?

When a $10,000 emergency flood call hits your line at 2:00 AM, Vocallis answers on Ring 1, runs IICRC triage, and wakes up your technician with the exact job details.