Clean blue flame. NAT GEO tests emissions of wood-fueled truck 
Be prepared and safe with an Interlock kit for your existing panel

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If you have an FPE panel you could be out of luck. I looked high and low. You can change the guts to a newer brand. You will have trouble with your insurance comp. anyway. "they don't like FPE" not only are the breakers not accurate,  the panel dimensions are too small also. 
Installation videos
SQUARE D Interlocks
Challenger Interlocks
SIEMENS Interlocks
Consider this
Cutler Hammer & EATON

GE interlocks

GE 150 - 225 Amp PowerMark Distribution Gold Load Center Generator Interlock Kit

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GE-200VA GE General Electric Generator I

GE-200VA GE General Electric Generator Interlock Kit for Vertical Main 150 or 200 amp breaker

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GE-200HDA GE General Electric Generator

GE-200HDA GE Generator Interlock  for Verticle Main  150 or 200 amp         

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GE-1 Generator Interlock Kit for General Electric Breaker Panel

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GE-100A  GE Generator Interlock Kit 100 or 125 amp panels

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GE-100A General Electric GE Generator In
Nema L14-30 Generator Power Cord 4 Wire

L14-30 Generator Power Cord 4 Wire 10 Gauge 125/250v 30 Amp 20 Feet

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50 ft  6/3 - 50 AMP

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Miady 20ft 30 Amp Generator Cord, 10 Gau

30 Amp Generator Cord, 10 Gauge Heavy Duty L14-30 20ft

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PB30 30-Amp NEMA 3R Power Inlet Box for Generators Up to 7,500 Running Watts

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Auto Transfer Switch - 30 Amp

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Adapts a 4-prong 30 AMP L14-30 receptacle to two -15 receptacles

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Reliance Controls Corporation PB50 50-Am

Power Inlet Box, 50-Amp for Generators Up to 12,500 Running Watts

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