Replacement 100 CFM fan / blower kit with timer control for Hearth & Home gas fireplaces. Used in natural gas (NG) and propane (LP) units. Includes blower, blower mounts, timer control (4021-708), power cord, hardware and instructions. Fits the following models:

Note: If your unit has an old style junction box (only has two outlets instead of 3) then you will not be able to use the timer control and must also purchase a BC10 rheostat to control the fan. The BC10 rheostat is available HERE.

Heatilator Gas Fireplaces:

• GCBC36 & GCBC36L
• GCBC36E & GCBC36LE
• GCBC42 & GCBC42L
• GCBC42E & GCBC42LE
• GCDC36 & GCDC36L
• GCDC36E & GCDC36LE
• GC361 & GC361L - After 47/94 (Can not use timer, must use BC10)
• GC361E & GC361LE - After 47/94 (Can not use timer, must use BC10)
• GC421 & GC421L - After 47/94 (Can not use timer, must use BC10)
• GC421E & GC421LE - After 47/94 (Can not use timer, must use BC10)
• GGBC36 & GGBC36L
• GGBC36E & GGBC36LE
• GGBC42 & GGBC42L
• GGBC42E & GGBC42LE
• GNBC33 & GNBC33L & S.I.T (Can not use timer, must use BC10)
• GNBC33E & GNBC33LE
• GNBC36 & GNBC36L, & S.I.T
• GNBC36E & GNBC36LE
• GNDC33 & GNDC33L & S.I.T
• GNDC36E & GNDC36LE (Can not use timer, must order BC10 rheostat)
• GNDH33 & GNDH33L, & S.I.T
• GNDH33E & GNDH33LE
• GNDH36 & GNDH36L & S.I.T
• GNDH36E & GNDH36LE
• GNRC33 & GNRC33L & S.I.T
• GNRC33E & GNRC33LE
• GNRC36 & GNRC36L & S.I.T
• GNRC36E & GNRC36LE
• GNRH33 & GNRH33L, & S.I.T
• GNRH33E & GNRH33LE
• GNRH36 & GNRH36L, S.I.T
• GNRH36E & GNRH36LE
• GNTC50 & GNTC50B
• ND3630IL 
• NBV4236I
• ND4236I & ND4236IL

Heatilator part # GFK4B
Replaces old part numbers FK4 (see note above regarding the junction box), 4031-439 and GFK4
OEM HHT part

May fit other models, please check your owner’s manual for part number compatibility.