What types of motherboards are supported by this micro ATX case?

This case supports mini ITX and micro ATX form factor motherboards.

What is the maximum GPU length supported by this case without a chassis fan?

The longest supported range of the graphics card is less than or equal to 250MM if no chassis fan is placed on the front board.

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matx case,itx case,High Airflow Micro ATX PC Case, Support MATX, Mini-ITX, Micro ATX case Slim with USB3.0x1 I/O Port, Black Without Fans

High PerformanceE Airflow: Micro atx PC case perforated front directly filtered air through the case to cool down components and enhance performance
Budget Design: Pre mounted holes supports mini ITX and m ATX Form Factor Motherboards.Can support normal size ATX power supply
A compact interior fits up to 2x 120mm and 1x 80mm cooling fans, along with radiatorsheight up to 135mm
GPU length limit: In the case of no chassis fan placed on the front board, the longest supported range of the graphics card is less than or equal to 250MM. If a fan is placed on the front board, the longest supported range of the graphics card is less than or equal to 225MM
USB3.0x1 USB2.0x1 I/O Port