Fan Types for Cigar Room Ventilation
Three fan categories dominate cigar room installations, with very different performance profiles at the airflow rates a cigar room requires.
Inline Centrifugal Fans — Recommended
Inline centrifugal fans — also called duct fans or inline blowers — are the standard choice for serious cigar room ventilation. Mounted inside the duct run rather than at the wall or ceiling, they offer two key advantages: the fan is acoustically isolated from the occupied space (typically 3–6 dB quieter at the listening position than an equivalent wall-mounted fan), and they can overcome significantly more static pressure resistance from long or complex duct runs.
Centrifugal impellers maintain higher airflow rates against real-world duct resistance than propeller fans of the same rated CFM — making them the correct choice for any duct run longer than about 4 feet or with more than one elbow.
- CFM range: 100–2,500+ CFM in commercial inline models
- Sone ratings: Quality units rate 1.5–4 sones at mid-speed; budget units can reach 8–10 sones
- ESP (external static pressure): The most capable residential inline fans are rated at 0.5–1.0 in. w.g. at rated CFM
- Motor types: PSC (standard) or EC (electronically commutated — variable speed, significantly more efficient, better acoustic profile)
Propeller Wall Fans
Direct-drive propeller fans mounted through the wall are the lowest-cost ventilation option and the most common in budget builds. They are effective at high CFM for their cost — but they are loud, especially at the airflow rates required for cigar rooms, and they cannot handle meaningful duct resistance. At 500 CFM, a propeller wall fan typically produces 65–75 dB at 5 feet — similar to a vacuum cleaner. Suitable only for exterior wall installation with a very short (0–3 ft) duct stub and in spaces where noise is not a consideration.
Why Bathroom Fans Fail in Cigar Rooms
Standard residential bathroom exhaust fans (50–150 CFM) are frequently found in amateur cigar room installations and are almost always inadequate.
ACH = (110 × 60) / 1,200 = 5.5 ACH
Target for a casual 2-person cigar lounge: 15 ACH
This fan delivers 37% of the minimum requirement.
To reach 15 ACH in this room:
CFM needed = (1,200 × 15) / 60 = 300 CFM — nearly 3× a standard bath fan.
Reading Fan Performance Curves
Every quality fan manufacturer publishes a performance curve showing the relationship between CFM (airflow) and static pressure (resistance). A fan's rated CFM is always measured at zero static pressure — no ductwork, no resistance, free air. As system resistance increases from duct length, elbows, and terminations, the actual delivered CFM drops along the performance curve.
Friction loss for 12-inch duct: ~0.08 in. w.g. per 100 ft
Example: 67 ft effective length in 12-inch duct
System ESP = (67 / 100) × 0.08 = 0.054 in. w.g.
Step 2: Find this ESP on the fan's performance curve
Step 3: Read the CFM delivered at that ESP
Fan rated 600 CFM free air → at 0.054 in. w.g.: ~560 CFM delivered
If delivered CFM < required CFM, select the next larger fan and re-check.
Fan Selection by Room Size and CFM Requirement
| CFM Required | Fan Type | Min. ESP Rating | Notes |
|---|---|---|---|
| 100–200 CFM | Inline centrifugal | 0.3 in. w.g. | Small personal lounge, single smoker |
| 200–400 CFM | Inline centrifugal | 0.4 in. w.g. | Medium lounge, 2–3 smokers, standard duct run |
| 400–700 CFM | Inline centrifugal (EC motor preferred) | 0.5 in. w.g. | Larger lounge or long duct run |
| 700–1,200 CFM | Inline centrifugal, commercial grade | 0.75 in. w.g. | Large lounge, 4–6 smokers; may need 2 fans in parallel |
| 1,200–2,500+ CFM | Commercial inline or paired fans | 1.0+ in. w.g. | Garage/large-space conversion; commercial-grade equipment |
Dual Fan Configurations
For high-CFM requirements, running two fans in a parallel duct configuration offers several advantages over a single large fan: redundancy if one fails, variable control (both fans for maximum ventilation, one fan for idle/post-session management), quieter combined operation than one large fan at full capacity, and easier installation through smaller duct runs.
Using parallel fans: each fan must deliver 450 CFM
Select: Two inline fans rated 550 CFM each
Both operating: ~900 CFM delivered
One fan only: ~450 CFM = approximately 10 ACH in a 1,600 cu ft room (adequate for light use)
Noise Ratings: Sones vs Decibels
| Sone Rating | Approx. dB | Perceived Level | Suitable For |
|---|---|---|---|
| 0.5–1.0 sones | ~28–33 dB | Near silent | Premium installations |
| 1.0–2.0 sones | ~33–40 dB | Very quiet hum | Excellent cigar lounge — target |
| 2.0–4.0 sones | ~40–48 dB | Noticeable but acceptable | Acceptable for most cigar rooms |
| 4.0–6.0 sones | ~48–54 dB | Like a refrigerator hum | Borderline for occupied lounge use |
| 6.0+ sones | 54+ dB | Distracting | Not suitable for occupied lounge use |
Controls and Speed Management
- Standard triac speed controls: Work with PSC motors but not EC motors. Avoid using triac controls with EC motor fans — they are incompatible and will damage the motor.
- Dedicated EC motor speed controls: Required for EC motor fans. These use a 0–10V or PWM control signal. Worth the additional cost for the quiet, efficient operation of EC fans.
- Occupancy-based automation: Connect a CO2 sensor, particulate sensor, or simple occupancy switch to ramp the fan from baseline to full when the room is in use.