BOULDER — Surna Inc. (OTCQB: SRNA), a Boulder-based manufacturer of growhouse equipment for the cannabis industry, has concerns about its long-term viability in the face of the ongoing COVID-19 pandemic and the nationwide economic downturn, the company reported this month in a regulatory disclosure.

Despite growing revenue in the first quarter of fiscal year 2020 — $1.81 million compared with $1.77 million in the same period in 2019 — Surna has struggled to turn a profit and downsized…

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