How to Size Your Fireplace

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How to Size Your Fireplace2020-11-27T13:32:20-05:00

Gas Log sizing for your fireplace can be hard, but our experts are here to help. Before speaking with them, here’s a couple things you may need. 

How to Size Your Fireplace

How to Size your Fireplace

1 Front Width

2 Rear Width

3 Depth

4 Height

Once you follow these steps, visit one of our showrooms with a picture of your fireplace along with these measurements and you’ll be well on your way to a new gas log set.

Want to learn more? Read below for detailed information on sizing.

Showrooms

Elmhurst Showroom

120 E. Lake Street
Elmhurst, IL 60126

Phone: (630) 279-8500

Mon-Thurs: 9AM – 6PM
Fri-Sat: 9AM – 5PM
Sun: Closed

Lisle Showroom

1702 Ogden Avenue
Lisle, IL 60126

Phone: (630) 969-8800

Mon-Thurs: 9AM – 6PM
Fri-Sat: 9AM – 5PM
Sun: Closed

Real Fyre Vented Gas Log Sizing

G4 & G45 Burner Sizing (Match Lit Only)
Log Size Front & Rear Width Depth Height BTU Rating
12" (G4) 16" Front & 12" Rear 11" 15" 25k (Nat & LP)
16" 19" Front & 16" Rear 11" 17" 39k (Nat & LP)
19" 22" Front & 17" Rear 11" 17" 39k (Nat & LP)
18/20" 24" Front & 18" Rear 13" 17" 75k (Nat) & 50k (LP)
24" 28" Front & 23" Rear 13" 17" 90k (Nat) & 65k (LP)
30" 34" Front & 27" Rear 14" 17" 90k (Nat) & 65k (LP)
36" 40" Front & 34" Rear 15" 17" 120k (Nat) & 90k (LP)
42" 46" Front & 40" Rear 20" 17" 130k (Nat) & 110k (LP)
48" 53" Front & 45" Rear 20" 17" 145k (Nat) & 115k (LP)
60" 64" Front & 56" Rear 20" 17" 150k (Nat) & 120k (LP)
G4 & G45 Burner Sizing (with Safety Pilot Kit)
Log Size Front & Rear Width Depth Height BTU Rating
12" (G4) 21" Front & 19" Rear 11" 15" 25k (Nat & LP)
16" 26" Front & 22" Rear 11" 17" 39k (Nat & LP)
19" 26" Front & 22" Rear 11" 17" 39k (Nat & LP)
18/20" 29" Front & 25" Rear 13" 17" 75k (Nat) & 50k (LP)
24" 34" Front & 29" Rear 13" 17" 90k (Nat) & 65k (LP)
30" 39" Front & 34" Rear 14" 17" 90k (Nat) & 65k (LP)
36" 46" Front & 39" Rear 15" 17" 120k (Nat) & 90k (LP)
42" 51" Front & 45" Rear 20" 17" 130k (Nat) & 110k (LP)
48" 58" Front & 52" Rear 20" 17" 145k (Nat) & 115k (LP)
60" 69" Front & 63" Rear 20" 17" 150k (Nat) & 120k (LP)
G45 ANSI Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
16/19" 26" Front & 23" Rear 11" 17" 40k (Nat) & 30k (LP)
18/20" 29" Front & 26" Rear 13" 17" 70k (Nat) & 45k (LP)
24" 34" Front & 30" Rear 13" 17" 90k (Nat) & 65k (LP)
30" 39" Front & 35" Rear 16" 17" 95k (Nat) & 75k (LP)
36" 46" Front & 40" Rear 16" 17" 110k (Nat) & 90k (LP)
G31 ANSI Burner Sizing (Match Lit Only)
Log Size Front & Rear Width Depth Height BTU Rating
18" 23" Front & 14" Rear 16" 17" 55k
24" 29" Front & 17" Rear 16" 17" 65k
30" 32" Front & 17" Rear 16" 17" 65k
33" 34" Front & 23" Rear 16" 17" 85k
39" 41" Front & 23" Rear 16" 17" 85k
G31 ANSI Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
18" 28" Front & 22" Rear 16" 17" 55k High & 20k Low (Nat) 40k High & 21k Low (LP)
24" 34" Front & 25" Rear 16" 17" 65k High & 21k Low (Nat) 50k High & 22k Low (LP)
30" 36" Front & 27" Rear 16" 17" 65k High & 21k Low (Nat) 50k High & 22k Low (LP)
33" 39" Front & 30" Rear 16" 17" 85k High & 22k Low (Nat) 60k High & 23k Low (LP)
39" 41" Front & 32" Rear 16" 17" 85k High & 22k Low (Nat) 60k High & 23k Low (LP)
G46 ANSI Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
18/20" 26" Front & 20" Rear 15" 17" 40k (Nat & LP)
24" 30" Front & 24" Rear 15" 17" 55k (Nat & LP)
30" 36" Front & 29" Rear 15" 17" 65k (Nat & LP)
G52 ANSI Burner Sizing (Match Lit Only)
Log Size Front & Rear Width Depth Height BTU Rating
18" 25" Front & 20" Rear 15" 17" 46k
24" 29" Front & 24" Rear 15" 17" 55k
30" 31" Front & 26" Rear 15" 17" 55k
G52 ANSI Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
18" 28" Front & 22" Rear 16" 17" 46k High & 33k Low (Nat) 36k High & 27k Low (LP)
24" 32" Front & 24" Rear 16" 17" 55k High & 37k Low (Nat) 46k High & 26k Low (LP)
30" 36" Front & 28" Rear 16" 17" 55k High & 37k Low (Nat) 46k High & 26k Low (LP)
P45 ANSI Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
18" 25" Front & 19" Rear 16" 17" 43k (Nat) & 36k (LP)
24" 31" Front & 25" Rear 16" 17" 65k (Nat) & 55k (LP)
30" 37" Front & 31" Rear 16" 17" 84k (Nat) & 70k (LP)
P45 ANSI Burner Sizing (Match Lit Only)
Log Size Front & Rear Width Depth Height BTU Rating
18" 24" Front & 18" Rear 15" 17" 43k (Nat)
24" 30" Front & 24" Rear 15" 17" 65k (Nat)
30" 36" Front & 30" Rear 15" 17" 84k (Nat)
G45-GL Burner Sizing (Match Lit Only)
Log Size Front & Rear Width Depth Height BTU Rating
16/19" 18" Front & 15" Rear 12" 16" 35k (Nat)
18/20" 23" Front & 17" Rear 12" 16" 55k (Nat)
24" 27" Front & 22" Rear 12" 16" 75k (Nat)
30" 33" Front & 26" Rear 12" 16" 75k (Nat)
36" 39" Front & 33" Rear 12" 16" 100k (Nat)
42" 45" Front & 39" Rear 12" 16" 105k (Nat)
48" 52" Front & 44" Rear 12" 16" 110k (Nat)
60" 63" Front & 55" Rear 12" 16" 120k (Nat)
G45-GL Burner Sizing (with Safety Pilot Kit)
Log Size Front & Rear Width Depth Height BTU Rating
16/19" 26" Front & 22" Rear 12" 16" 35k (Nat) & 28k (LP)
18/20" 29" Front & 25" Rear 12" 16" 55k (Nat) & 38k (LP)
24" 34" Front & 29" Rear 12" 16" 75k (Nat) & 50k (LP)
30" 39" Front & 34" Rear 12" 16" 75k (Nat) & 60k (LP)
36" 46" Front & 39" Rear 12" 16" 100k (Nat) & 70k (LP)
42" 51" Front & 45" Rear 12" 16" 105k (Nat) & 85k (LP)
48" 58" Front & 52" Rear 12" 16" 110k (Nat) & 90k (LP)
60" 69" Front & 63" Rear 12" 16" 120k (Nat) & 105k (LP)

Real Fyre Vent Free Gas Log Sizing

G8 Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
16" 17" Front & 13" Rear 9 1/2" 17" 20k (Nat) & 9.5k (LP)
20" 21" Front & 13" Rear 9 1/2" 17" 20k (Nat) & 9.5k (LP)
24" 26" Front & 13" Rear 9 1/2" 17" 20k (Nat) & 9.5k (LP)
G9 Burner Sizing (Manual Valve)
Log Size Front & Rear Width Depth Height BTU Rating
20" 24" Front & 20" Rear 14" 18" 36k High & 17k Low (Nat & LP)
24" 29" Front & 20" Rear 14" 18" 36k High & 17k Low (Nat & LP)
30" 34" Front & 26" Rear 14" 18" 36k High & 17k Low (Nat & LP)
G9 Burner Sizing (Millivolt Valve)
Log Size Front & Rear Width Depth Height BTU Rating
20" 26" Front & 22" Rear 14" 18" 36k High & 21k Low (Nat & LP)
24" 30" Front & 22" Rear 14" 18" 36k High & 21k Low (Nat & LP)
30" 34" Front & 26" Rear 14" 18" 36k High & 21k Low (Nat & LP)
G10 Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
16/18" 22" Front & 20" Rear 13" 18" 35k High & 32k Low (Nat & LP)
24" 28" Front & 20" Rear 14" 18" 37k High & 19k Low (Nat & LP)
30" 34" Front & 20" Rear 14" 18" 37k High & 19k Low (Nat & LP)
G18 Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
16/18" 22" Front & 20" Rear 13" 18" 30k (Nat & LP)
24" 30" Front & 20" Rear 14" 18" 38k (Nat & LP)
30" 36" Front & 26" Rear 14" 18" 38k (Nat & LP)
G21-GL Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
18" 22" Front & 16" Rear 13" 15" 30k (Nat) & 27k (LP)
24" 28" Front & 21" Rear 13" 15" 35k (Nat) & 30k (LP)
30" 34" Front & 28" Rear 13" 15" 40k (Nat) & 35k (LP)
G19 Burner Sizing
Log Size Front & Rear Width Depth Height BTU Rating
18" 24" Front & 22" Rear 14" 16" 31k (Nat) & 30k (LP)
24" 30" Front & 24" Rear 14" 16" 40k (Nat) & 34k (LP)
30" 34" Front & 26" Rear 14" 16" 40k (Nat) & 34k (LP)
G18-2 Burner Sizing
Log Size Front Width Depth Height BTU Rating
16/18" 22" Front 18" 18" 35k (Nat & LP)
24" 26" Front 18" 18" 40k (Nat & LP)
G9-2 Burner Sizing (Millivolt)
Log Size Front Width Depth Height BTU Rating
24" 28" Front 18" 18" 39k (Nat & LP)

American Hearth Vent Free Gas Log Sizing

VFSM Burner Sizing
Log Size Front Width Depth Height BTU Rating
18" 32" Front & 21" Rear 14" 17" 32k (Nat & LP)
24" 34" Front & 27" Rear 14" 18" 36k (Nat & LP)
30" 38" Front & 30" Rear 14" 20" 38k (Nat & LP)
VFSR Burner Sizing
Log Size Front Width Depth Height BTU Rating
16" 24" Front & 18" Rear 11 1/2" 18" 25k (Nat & LP)
18" 28" Front & 17" Rear 14" 17" 32k (Nat & LP)
24" 30" Front & 23" Rear 14" 18" 36k (Nat & LP)
30" 34" Front & 26" Rear 14" 20" 38k (Nat & LP)
VFSV Burner Sizing
Log Size Front Width Depth Height BTU Rating
16" 24" Front & 18" Rear 11 1/2" 18" 25k (Nat & LP)
18" 28" Front & 17" Rear 14" 17" 32k (Nat & LP)
24" 30" Front & 23" Rear 14" 18" 36k (Nat & LP)
30" 34" Front & 26" Rear 14" 20" 38k (Nat & LP)
VFSE Burner Sizing
Log Size Front Width Depth Height BTU Rating
18" 28" Front & 17" Rear 14" 17" 32k (Nat & LP)
24" 30" Front & 23" Rear 14" 18" 36k (Nat & LP)
30" 34" Front & 26" Rear 14" 20" 38k (Nat & LP)
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