Fan Splitter: New Mobo 4-Pin to 3-Pin Fans

Route44

TechSpot Ambassador
I am building a new non-gaming system (no video card needed) for someone on a limited budget so in order to fit within the monetary parameters I am using an his old but serviceable case from the mid 2000s. The new Micro motherboard has one four fan header. The fans are the old black/yellow/red wired ones with the the 3-pin female connectors.

I am only needing 2 fans (but three if I can work it out.). If I get a 4-pin splitter the power draw should not be too much, will it? The fans are each 12v 120mm and an 80mm. Any suggestions for a splitter? Thanks.