Gas Vent Terminations Roof

Reference data and engineering information about gas vent terminations roof for combustion applications.

gasventterminationsroof

Overview

Engineering reference data for Gas Vent Terminations Roof in combustion engineering.

Key Formulas

Heat Release

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

Air-Fuel Ratio

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

Excess Air

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

Variables

Symbol	Description	Unit
$Q$	Heat release rate	W
$\dot{m}$	Mass flow rate	kg/s
$HV$	Heating value	J/kg
$AF$	Air-fuel ratio	—

Vent Termination Clearance Data

The required clearance between gas vent terminations and the roof surface increases with steeper roof slopes to ensure proper venting and safety. This table provides the clearance specifications based on roof slope and corresponding degrees.

7 rows

Gas Vent Termination Clearance vs. Roof Slope
Roof Slope	Roof Degrees(°)	Clearance(in)
flat to 6/12	27	12
6/12 - 7/12	27 - 30	15
7/12 - 8/12	30 - 34	18
8/12 - 9/12	34 - 37	24
9/12 - 10/12	37 - 40	30
10/12 - 11/12	40 - 43	39
11/12 - 12/12	43 - 45	48

Source: engineeringtoolbox.com

Interactive Charts

clearance gas vent room

References

Original Source

Source: engineeringtoolbox.com