Can I place a dresser in front of the main air intake grill?

There's a huge air intake grill directly in my hallway, and its kinda unsightly. We've had a dresser/console directly in front of it for 2 years, about six inches away. Does this impact the performance of the HVAC? A third of the HVAC is completely unblocked and 2/3 of it is "blocked" except the 6-inch gap from the console. Should I remove the furniture? Any advice appreciated!