Generalaire 4002 G99 Media Air Cleaner Gauge | 0.1–0.4 Inches W.C.
📝 Product Description
The Generalaire 4002 G99 Media Air Cleaner Gauge provides a reliable visual indication of when it’s time to replace your air filters in forced air heating and cooling systems. Designed to operate in a negative pressure range from 0.1 to 0.4 inches W.C., the gauge ensures accurate monitoring of filter performance.
When properly calibrated, a vacuum increase of 0.10 to 0.15 inches W.C. signals that the air filter should be replaced. The G99 gauge installs conveniently between the blower and the filter, where the slight vacuum created by air flow resistance moves a vane in proportion to the negative pressure. As the filter accumulates dirt and restricts airflow, the vane rises to indicate a filter change is necessary, helping maintain system efficiency and air quality.
✅ Key Features
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✅ Operating Range: 0.1–0.4 inches W.C.
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✅ Visual Filter Change Indicator: Easy-to-read vane
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✅ Vacuum Increase Trigger: 0.10–0.15 inches W.C. for filter replacement
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✅ Installation Location: Between blower and air filter
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✅ Application: Forced air heating and cooling systems
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✅ Improves System Efficiency: Ensures timely filter replacement
📊 Specifications Table
| Category | Details |
|---|
| Model |
4002 G99 |
| Type |
Media Air Cleaner Gauge |
| Measurement Range |
0.1–0.4 inches W.C. |
| Trigger for Replacement |
0.10–0.15 inches W.C. increase |
| Installation Location |
Between blower and air filter |
| Application |
Forced air heating & cooling |
| Indicator Type |
Vane / visual |
⚠️ Common Symptoms (When to Replace)
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Reduced airflow through the HVAC system
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Higher energy bills due to restricted filters
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Visible dirt accumulation on air filter
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Vane on the G99 gauge reaches the replacement mark
❓ Frequently Asked Questions (FAQ)
Q1: Where should the G99 gauge be installed?
➡️ Between the blower and the air filter in your HVAC system.
Q2: How does it indicate a filter change?
➡️ As the filter loads and airflow restriction increases, the vane rises to signal replacement.
Q3: What is the calibrated range?
➡️ 0.1–0.4 inches W.C., with a 0.10–0.15 inches W.C. vacuum increase indicating replacement.
Q4: What types of systems is it compatible with?
➡️ Designed for forced air heating and cooling systems.
🛒 Shopping Tips
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🔧 Ensure proper installation for accurate readings.
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🧰 Use with all standard media air filters.
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⚡ Regular monitoring helps maintain air quality and system efficiency.
