Cross-section
Δ Pa vs. outdoor reference (when tubed)Per-floor detail
last 60 sPressure timeline
— · all enabled floorsContext
- House has an active backdrafting problem when ERV (1st floor) + HRV (2nd floor) run — atmospheric gas boiler & WH in basement share a chimney flue. The basement's continuous 4" supply fan is undersized vs. combined upstairs exhaust.
- What this dashboard tells you: each floor's pressure relative to its outdoor reference. A healthy basement reads near zero or slightly positive. Sustained negative basement pressure while gas appliances are firing = real CO risk.
- Sensor: Sensirion SDP810-500Pa on Olimex ESP32-POE-ISO. 1 Hz sampling, 60 s averaging.
- Diagnostic only — not in any safety interlock chain. Keep your UL-2034 CO alarms on every floor.